From 216570ad988108c69b7105740ab382c544c2b034 Mon Sep 17 00:00:00 2001
From: Claire <claire.github-309c@sitedethib.com>
Date: Thu, 14 Oct 2021 19:59:21 +0200
Subject: [PATCH 1/5] Fix scheduled statuses decreasing statuses counts
 (#16791)

* Add tests

* Fix scheduled statuses decreasing statuses counts

Fixes #16774
---
 app/models/status.rb                      |  2 +-
 app/services/post_status_service.rb       |  3 ++
 spec/services/post_status_service_spec.rb | 42 +++++++++++++----------
 3 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/app/models/status.rb b/app/models/status.rb
index 847921ac23..3acf759f9d 100644
--- a/app/models/status.rb
+++ b/app/models/status.rb
@@ -426,7 +426,7 @@ class Status < ApplicationRecord
   end
 
   def decrement_counter_caches
-    return if direct_visibility?
+    return if direct_visibility? || new_record?
 
     account&.decrement_count!(:statuses_count)
     reblog&.decrement_count!(:reblogs_count) if reblog?
diff --git a/app/services/post_status_service.rb b/app/services/post_status_service.rb
index 0a383d6a39..85aaec4d65 100644
--- a/app/services/post_status_service.rb
+++ b/app/services/post_status_service.rb
@@ -74,6 +74,9 @@ class PostStatusService < BaseService
     status_for_validation = @account.statuses.build(status_attributes)
 
     if status_for_validation.valid?
+      # Marking the status as destroyed is necessary to prevent the status from being
+      # persisted when the associated media attachments get updated when creating the
+      # scheduled status.
       status_for_validation.destroy
 
       # The following transaction block is needed to wrap the UPDATEs to
diff --git a/spec/services/post_status_service_spec.rb b/spec/services/post_status_service_spec.rb
index 147a59fc31..d21270c793 100644
--- a/spec/services/post_status_service_spec.rb
+++ b/spec/services/post_status_service_spec.rb
@@ -25,29 +25,33 @@ RSpec.describe PostStatusService, type: :service do
     expect(status.thread).to eq in_reply_to_status
   end
 
-  it 'schedules a status' do
-    account = Fabricate(:account)
-    future  = Time.now.utc + 2.hours
+  context 'when scheduling a status' do
+    let!(:account)         { Fabricate(:account) }
+    let!(:future)          { Time.now.utc + 2.hours }
+    let!(:previous_status) { Fabricate(:status, account: account) }
 
-    status = subject.call(account, text: 'Hi future!', scheduled_at: future)
+    it 'schedules a status' do
+      status = subject.call(account, text: 'Hi future!', scheduled_at: future)
+      expect(status).to be_a ScheduledStatus
+      expect(status.scheduled_at).to eq future
+      expect(status.params['text']).to eq 'Hi future!'
+    end
 
-    expect(status).to be_a ScheduledStatus
-    expect(status.scheduled_at).to eq future
-    expect(status.params['text']).to eq 'Hi future!'
-  end
+    it 'does not immediately create a status' do
+      media = Fabricate(:media_attachment, account: account)
+      status = subject.call(account, text: 'Hi future!', media_ids: [media.id], scheduled_at: future)
 
-  it 'does not immediately create a status when scheduling a status' do
-    account = Fabricate(:account)
-    media = Fabricate(:media_attachment)
-    future  = Time.now.utc + 2.hours
+      expect(status).to be_a ScheduledStatus
+      expect(status.scheduled_at).to eq future
+      expect(status.params['text']).to eq 'Hi future!'
+      expect(status.params['media_ids']).to eq [media.id]
+      expect(media.reload.status).to be_nil
+      expect(Status.where(text: 'Hi future!').exists?).to be_falsey
+    end
 
-    status = subject.call(account, text: 'Hi future!', media_ids: [media.id], scheduled_at: future)
-
-    expect(status).to be_a ScheduledStatus
-    expect(status.scheduled_at).to eq future
-    expect(status.params['text']).to eq 'Hi future!'
-    expect(media.reload.status).to be_nil
-    expect(Status.where(text: 'Hi future!').exists?).to be_falsey
+    it 'does not change statuses count' do
+      expect { subject.call(account, text: 'Hi future!', scheduled_at: future, thread: previous_status) }.not_to change { [account.statuses_count, previous_status.replies_count] }
+    end
   end
 
   it 'creates response to the original status of boost' do

From 959f7fc580050b37741c92b645b842e45017a010 Mon Sep 17 00:00:00 2001
From: Claire <claire.github-309c@sitedethib.com>
Date: Thu, 14 Oct 2021 19:59:28 +0200
Subject: [PATCH 2/5] Fix tootctl self-destruct not sending Delete activities
 for recently-suspended accounts (#16688)

* Do not block existing users' emails on self-destruct

That is wasteful and unintuitive

* Do not close registrations when running tootctl self-destruct with --dry-run

* Close registrations on self-destruct regardless of known remote accounts

* Fix tootctl self-destruct not sending Deletes for recently-suspended accounts

* Suspend local users even if no remote account is known

* Do not show scary confirmation text if ran with --dry-run
---
 lib/cli.rb | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/lib/cli.rb b/lib/cli.rb
index 3f1658566b..8815e137ad 100644
--- a/lib/cli.rb
+++ b/lib/cli.rb
@@ -94,17 +94,22 @@ module Mastodon
 
       exit(1) unless prompt.ask('Type in the domain of the server to confirm:', required: true) == Rails.configuration.x.local_domain
 
-      prompt.warn('This operation WILL NOT be reversible. It can also take a long time.')
-      prompt.warn('While the data won\'t be erased locally, the server will be in a BROKEN STATE afterwards.')
-      prompt.warn('A running Sidekiq process is required. Do not shut it down until queues clear.')
+      unless options[:dry_run]
+        prompt.warn('This operation WILL NOT be reversible. It can also take a long time.')
+        prompt.warn('While the data won\'t be erased locally, the server will be in a BROKEN STATE afterwards.')
+        prompt.warn('A running Sidekiq process is required. Do not shut it down until queues clear.')
 
-      exit(1) if prompt.no?('Are you sure you want to proceed?')
+        exit(1) if prompt.no?('Are you sure you want to proceed?')
+      end
 
       inboxes   = Account.inboxes
       processed = 0
       dry_run   = options[:dry_run] ? ' (DRY RUN)' : ''
 
+      Setting.registrations_mode = 'none' unless options[:dry_run]
+
       if inboxes.empty?
+        Account.local.without_suspended.in_batches.update_all(suspended_at: Time.now.utc, suspension_origin: :local) unless options[:dry_run]
         prompt.ok('It seems like your server has not federated with anything')
         prompt.ok('You can shut it down and delete it any time')
         return
@@ -112,9 +117,7 @@ module Mastodon
 
       prompt.warn('Do NOT interrupt this process...')
 
-      Setting.registrations_mode = 'none'
-
-      Account.local.without_suspended.find_each do |account|
+      delete_account = ->(account) do
         payload = ActiveModelSerializers::SerializableResource.new(
           account,
           serializer: ActivityPub::DeleteActorSerializer,
@@ -128,12 +131,15 @@ module Mastodon
             [json, account.id, inbox_url]
           end
 
-          account.suspend!
+          account.suspend!(block_email: false)
         end
 
         processed += 1
       end
 
+      Account.local.without_suspended.find_each { |account| delete_account.call(account) }
+      Account.local.suspended.joins(:deletion_request).find_each { |account| delete_account.call(account) }
+
       prompt.ok("Queued #{inboxes.size * processed} items into Sidekiq for #{processed} accounts#{dry_run}")
       prompt.ok('Wait until Sidekiq processes all items, then you can shut everything down and delete the data')
     rescue TTY::Reader::InputInterrupt

From 07341e7aa60fe7c7d4f298136af99276820940e7 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Thu, 14 Oct 2021 20:44:59 +0200
Subject: [PATCH 3/5] Add graphs and retention metrics to admin dashboard
 (#16829)

---
 app/controllers/admin/dashboard_controller.rb |  36 +---
 .../api/v1/admin/dimensions_controller.rb     |  23 +++
 .../api/v1/admin/measures_controller.rb       |  22 ++
 .../api/v1/admin/retention_controller.rb      |  22 ++
 .../api/v1/admin/trends_controller.rb         |  16 ++
 .../api/v1/instances/activity_controller.rb   |  23 +--
 app/helpers/application_helper.rb             |   4 +
 .../mastodon/components/admin/Counter.js      | 115 +++++++++++
 .../mastodon/components/admin/Dimension.js    |  92 +++++++++
 .../mastodon/components/admin/Retention.js    | 141 +++++++++++++
 .../mastodon/components/admin/Trends.js       |  73 +++++++
 app/javascript/mastodon/components/hashtag.js |  61 +++---
 .../mastodon/components/skeleton.js           |  11 +
 .../mastodon/containers/admin_component.js    |  26 +++
 .../mastodon/containers/media_container.js    |   2 +-
 .../compose/components/search_results.js      |   2 +-
 .../getting_started/components/trends.js      |   2 +-
 app/javascript/mastodon/utils/numbers.js      |   8 +
 app/javascript/packs/admin.js                 |  20 ++
 app/javascript/styles/mastodon/admin.scss     | 193 +++++++++++++++++-
 .../styles/mastodon/components.scss           |  53 ++++-
 app/javascript/styles/mastodon/dashboard.scss |  57 ++++--
 app/lib/activity_tracker.rb                   |  76 +++++--
 app/lib/admin/metrics/dimension.rb            |  15 ++
 .../admin/metrics/dimension/base_dimension.rb |  31 +++
 .../metrics/dimension/languages_dimension.rb  |  23 +++
 .../metrics/dimension/servers_dimension.rb    |  23 +++
 .../dimension/software_versions_dimension.rb  |  69 +++++++
 .../metrics/dimension/sources_dimension.rb    |  23 +++
 .../dimension/space_usage_dimension.rb        |  70 +++++++
 app/lib/admin/metrics/measure.rb              |  15 ++
 .../metrics/measure/active_users_measure.rb   |  33 +++
 app/lib/admin/metrics/measure/base_measure.rb |  46 +++++
 .../metrics/measure/interactions_measure.rb   |  33 +++
 .../metrics/measure/new_users_measure.rb      |  35 ++++
 .../metrics/measure/opened_reports_measure.rb |  35 ++++
 .../measure/resolved_reports_measure.rb       |  36 ++++
 app/lib/admin/metrics/retention.rb            |  67 ++++++
 app/presenters/instance_presenter.rb          |   4 +-
 .../rest/admin/cohort_serializer.rb           |  19 ++
 .../rest/admin/dimension_serializer.rb        |   5 +
 .../rest/admin/measure_serializer.rb          |  13 ++
 app/serializers/rest/admin/tag_serializer.rb  |  13 ++
 app/views/admin/dashboard/index.html.haml     | 173 +++++-----------
 config/locales/en.yml                         |  42 ++--
 config/routes.rb                              |   6 +
 46 files changed, 1650 insertions(+), 257 deletions(-)
 create mode 100644 app/controllers/api/v1/admin/dimensions_controller.rb
 create mode 100644 app/controllers/api/v1/admin/measures_controller.rb
 create mode 100644 app/controllers/api/v1/admin/retention_controller.rb
 create mode 100644 app/controllers/api/v1/admin/trends_controller.rb
 create mode 100644 app/javascript/mastodon/components/admin/Counter.js
 create mode 100644 app/javascript/mastodon/components/admin/Dimension.js
 create mode 100644 app/javascript/mastodon/components/admin/Retention.js
 create mode 100644 app/javascript/mastodon/components/admin/Trends.js
 create mode 100644 app/javascript/mastodon/components/skeleton.js
 create mode 100644 app/javascript/mastodon/containers/admin_component.js
 create mode 100644 app/lib/admin/metrics/dimension.rb
 create mode 100644 app/lib/admin/metrics/dimension/base_dimension.rb
 create mode 100644 app/lib/admin/metrics/dimension/languages_dimension.rb
 create mode 100644 app/lib/admin/metrics/dimension/servers_dimension.rb
 create mode 100644 app/lib/admin/metrics/dimension/software_versions_dimension.rb
 create mode 100644 app/lib/admin/metrics/dimension/sources_dimension.rb
 create mode 100644 app/lib/admin/metrics/dimension/space_usage_dimension.rb
 create mode 100644 app/lib/admin/metrics/measure.rb
 create mode 100644 app/lib/admin/metrics/measure/active_users_measure.rb
 create mode 100644 app/lib/admin/metrics/measure/base_measure.rb
 create mode 100644 app/lib/admin/metrics/measure/interactions_measure.rb
 create mode 100644 app/lib/admin/metrics/measure/new_users_measure.rb
 create mode 100644 app/lib/admin/metrics/measure/opened_reports_measure.rb
 create mode 100644 app/lib/admin/metrics/measure/resolved_reports_measure.rb
 create mode 100644 app/lib/admin/metrics/retention.rb
 create mode 100644 app/serializers/rest/admin/cohort_serializer.rb
 create mode 100644 app/serializers/rest/admin/dimension_serializer.rb
 create mode 100644 app/serializers/rest/admin/measure_serializer.rb
 create mode 100644 app/serializers/rest/admin/tag_serializer.rb

diff --git a/app/controllers/admin/dashboard_controller.rb b/app/controllers/admin/dashboard_controller.rb
index c829ed98f8..cbfff27075 100644
--- a/app/controllers/admin/dashboard_controller.rb
+++ b/app/controllers/admin/dashboard_controller.rb
@@ -1,49 +1,17 @@
 # frozen_string_literal: true
-require 'sidekiq/api'
 
 module Admin
   class DashboardController < BaseController
     def index
       @system_checks         = Admin::SystemCheck.perform
-      @users_count           = User.count
+      @time_period           = (1.month.ago.to_date...Time.now.utc.to_date)
       @pending_users_count   = User.pending.count
-      @registrations_week    = Redis.current.get("activity:accounts:local:#{current_week}") || 0
-      @logins_week           = Redis.current.pfcount("activity:logins:#{current_week}")
-      @interactions_week     = Redis.current.get("activity:interactions:#{current_week}") || 0
-      @relay_enabled         = Relay.enabled.exists?
-      @single_user_mode      = Rails.configuration.x.single_user_mode
-      @registrations_enabled = Setting.registrations_mode != 'none'
-      @deletions_enabled     = Setting.open_deletion
-      @invites_enabled       = Setting.min_invite_role == 'user'
-      @search_enabled        = Chewy.enabled?
-      @version               = Mastodon::Version.to_s
-      @database_version      = ActiveRecord::Base.connection.execute('SELECT VERSION()').first['version'].match(/\A(?:PostgreSQL |)([^\s]+).*\z/)[1]
-      @redis_version         = redis_info['redis_version']
-      @reports_count         = Report.unresolved.count
-      @queue_backlog         = Sidekiq::Stats.new.enqueued
-      @recent_users          = User.confirmed.recent.includes(:account).limit(8)
-      @database_size         = ActiveRecord::Base.connection.execute('SELECT pg_database_size(current_database())').first['pg_database_size']
-      @redis_size            = redis_info['used_memory']
-      @ldap_enabled          = ENV['LDAP_ENABLED'] == 'true'
-      @cas_enabled           = ENV['CAS_ENABLED'] == 'true'
-      @saml_enabled          = ENV['SAML_ENABLED'] == 'true'
-      @pam_enabled           = ENV['PAM_ENABLED'] == 'true'
-      @hidden_service        = ENV['ALLOW_ACCESS_TO_HIDDEN_SERVICE'] == 'true'
-      @trending_hashtags     = TrendingTags.get(10, filtered: false)
+      @pending_reports_count = Report.unresolved.count
       @pending_tags_count    = Tag.pending_review.count
-      @authorized_fetch      = authorized_fetch_mode?
-      @whitelist_enabled     = whitelist_mode?
-      @profile_directory     = Setting.profile_directory
-      @timeline_preview      = Setting.timeline_preview
-      @trends_enabled        = Setting.trends
     end
 
     private
 
-    def current_week
-      @current_week ||= Time.now.utc.to_date.cweek
-    end
-
     def redis_info
       @redis_info ||= begin
         if Redis.current.is_a?(Redis::Namespace)
diff --git a/app/controllers/api/v1/admin/dimensions_controller.rb b/app/controllers/api/v1/admin/dimensions_controller.rb
new file mode 100644
index 0000000000..170596d273
--- /dev/null
+++ b/app/controllers/api/v1/admin/dimensions_controller.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::DimensionsController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action :require_staff!
+  before_action :set_dimensions
+
+  def create
+    render json: @dimensions, each_serializer: REST::Admin::DimensionSerializer
+  end
+
+  private
+
+  def set_dimensions
+    @dimensions = Admin::Metrics::Dimension.retrieve(
+      params[:keys],
+      params[:start_at],
+      params[:end_at],
+      params[:limit]
+    )
+  end
+end
diff --git a/app/controllers/api/v1/admin/measures_controller.rb b/app/controllers/api/v1/admin/measures_controller.rb
new file mode 100644
index 0000000000..a3ac6fe85f
--- /dev/null
+++ b/app/controllers/api/v1/admin/measures_controller.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::MeasuresController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action :require_staff!
+  before_action :set_measures
+
+  def create
+    render json: @measures, each_serializer: REST::Admin::MeasureSerializer
+  end
+
+  private
+
+  def set_measures
+    @measures = Admin::Metrics::Measure.retrieve(
+      params[:keys],
+      params[:start_at],
+      params[:end_at]
+    )
+  end
+end
diff --git a/app/controllers/api/v1/admin/retention_controller.rb b/app/controllers/api/v1/admin/retention_controller.rb
new file mode 100644
index 0000000000..a8ff64f21d
--- /dev/null
+++ b/app/controllers/api/v1/admin/retention_controller.rb
@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::RetentionController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action :require_staff!
+  before_action :set_cohorts
+
+  def create
+    render json: @cohorts, each_serializer: REST::Admin::CohortSerializer
+  end
+
+  private
+
+  def set_cohorts
+    @cohorts = Admin::Metrics::Retention.new(
+      params[:start_at],
+      params[:end_at],
+      params[:frequency]
+    ).cohorts
+  end
+end
diff --git a/app/controllers/api/v1/admin/trends_controller.rb b/app/controllers/api/v1/admin/trends_controller.rb
new file mode 100644
index 0000000000..e32ab5d2c7
--- /dev/null
+++ b/app/controllers/api/v1/admin/trends_controller.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::TrendsController < Api::BaseController
+  before_action :require_staff!
+  before_action :set_trends
+
+  def index
+    render json: @trends, each_serializer: REST::Admin::TagSerializer
+  end
+
+  private
+
+  def set_trends
+    @trends = TrendingTags.get(10, filtered: false)
+  end
+end
diff --git a/app/controllers/api/v1/instances/activity_controller.rb b/app/controllers/api/v1/instances/activity_controller.rb
index 4f6b4bcbfa..bad61425a5 100644
--- a/app/controllers/api/v1/instances/activity_controller.rb
+++ b/app/controllers/api/v1/instances/activity_controller.rb
@@ -14,22 +14,21 @@ class Api::V1::Instances::ActivityController < Api::BaseController
   private
 
   def activity
-    weeks = []
+    statuses_tracker      = ActivityTracker.new('activity:statuses:local', :basic)
+    logins_tracker        = ActivityTracker.new('activity:logins', :unique)
+    registrations_tracker = ActivityTracker.new('activity:accounts:local', :basic)
 
-    12.times do |i|
-      day     = i.weeks.ago.to_date
-      week_id = day.cweek
-      week    = Date.commercial(day.cwyear, week_id)
+    (0...12).map do |i|
+      start_of_week = i.weeks.ago
+      end_of_week   = start_of_week + 6.days
 
-      weeks << {
-        week: week.to_time.to_i.to_s,
-        statuses: Redis.current.get("activity:statuses:local:#{week_id}") || '0',
-        logins: Redis.current.pfcount("activity:logins:#{week_id}").to_s,
-        registrations: Redis.current.get("activity:accounts:local:#{week_id}") || '0',
+      {
+        week: start_of_week.to_i.to_s,
+        statuses: statuses_tracker.sum(start_of_week, end_of_week).to_s,
+        logins: logins_tracker.sum(start_of_week, end_of_week).to_s,
+        registrations: registrations_tracker.sum(start_of_week, end_of_week).to_s,
       }
     end
-
-    weeks
   end
 
   def require_enabled_api!
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index a39e8e5bf8..34fc46615f 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -137,6 +137,10 @@ module ApplicationHelper
     end
   end
 
+  def react_admin_component(name, props = {})
+    content_tag(:div, nil, data: { 'admin-component': name.to_s.camelcase, props: Oj.dump({ locale: I18n.locale }.merge(props)) })
+  end
+
   def body_classes
     output = (@body_classes || '').split(' ')
     output << "theme-#{current_theme.parameterize}"
diff --git a/app/javascript/mastodon/components/admin/Counter.js b/app/javascript/mastodon/components/admin/Counter.js
new file mode 100644
index 0000000000..cda572dced
--- /dev/null
+++ b/app/javascript/mastodon/components/admin/Counter.js
@@ -0,0 +1,115 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import api from 'mastodon/api';
+import { FormattedNumber } from 'react-intl';
+import { Sparklines, SparklinesCurve } from 'react-sparklines';
+import classNames from 'classnames';
+import Skeleton from 'mastodon/components/skeleton';
+
+const percIncrease = (a, b) => {
+  let percent;
+
+  if (b !== 0) {
+    if (a !== 0) {
+      percent = (b - a) / a;
+    } else {
+      percent = 1;
+    }
+  } else if (b === 0 && a === 0) {
+    percent = 0;
+  } else {
+    percent = - 1;
+  }
+
+  return percent;
+};
+
+export default class Counter extends React.PureComponent {
+
+  static propTypes = {
+    measure: PropTypes.string.isRequired,
+    start_at: PropTypes.string.isRequired,
+    end_at: PropTypes.string.isRequired,
+    label: PropTypes.string.isRequired,
+    href: PropTypes.string,
+  };
+
+  state = {
+    loading: true,
+    data: null,
+  };
+
+  componentDidMount () {
+    const { measure, start_at, end_at } = this.props;
+
+    api().post('/api/v1/admin/measures', { keys: [measure], start_at, end_at }).then(res => {
+      this.setState({
+        loading: false,
+        data: res.data,
+      });
+    }).catch(err => {
+      console.error(err);
+    });
+  }
+
+  render () {
+    const { label, href } = this.props;
+    const { loading, data } = this.state;
+
+    let content;
+
+    if (loading) {
+      content = (
+        <React.Fragment>
+          <span className='sparkline__value__total'><Skeleton width={43} /></span>
+          <span className='sparkline__value__change'><Skeleton width={43} /></span>
+        </React.Fragment>
+      );
+    } else {
+      const measure = data[0];
+      const percentChange = percIncrease(measure.previous_total * 1, measure.total * 1);
+
+      content = (
+        <React.Fragment>
+          <span className='sparkline__value__total'><FormattedNumber value={measure.total} /></span>
+          <span className={classNames('sparkline__value__change', { positive: percentChange > 0, negative: percentChange < 0 })}>{percentChange > 0 && '+'}<FormattedNumber value={percentChange} style='percent' /></span>
+        </React.Fragment>
+      );
+    }
+
+    const inner = (
+      <React.Fragment>
+        <div className='sparkline__value'>
+          {content}
+        </div>
+
+        <div className='sparkline__label'>
+          {label}
+        </div>
+
+        <div className='sparkline__graph'>
+          {!loading && (
+            <Sparklines width={259} height={55} data={data[0].data.map(x => x.value * 1)}>
+              <SparklinesCurve />
+            </Sparklines>
+          )}
+        </div>
+      </React.Fragment>
+    );
+
+    if (href) {
+      return (
+        <a href={href} className='sparkline'>
+          {inner}
+        </a>
+      );
+    } else {
+      return (
+        <div className='sparkline'>
+          {inner}
+        </div>
+      );
+    }
+  }
+
+}
diff --git a/app/javascript/mastodon/components/admin/Dimension.js b/app/javascript/mastodon/components/admin/Dimension.js
new file mode 100644
index 0000000000..ac6dbd1c79
--- /dev/null
+++ b/app/javascript/mastodon/components/admin/Dimension.js
@@ -0,0 +1,92 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import api from 'mastodon/api';
+import { FormattedNumber } from 'react-intl';
+import { roundTo10 } from 'mastodon/utils/numbers';
+import Skeleton from 'mastodon/components/skeleton';
+
+export default class Dimension extends React.PureComponent {
+
+  static propTypes = {
+    dimension: PropTypes.string.isRequired,
+    start_at: PropTypes.string.isRequired,
+    end_at: PropTypes.string.isRequired,
+    limit: PropTypes.number.isRequired,
+    label: PropTypes.string.isRequired,
+  };
+
+  state = {
+    loading: true,
+    data: null,
+  };
+
+  componentDidMount () {
+    const { start_at, end_at, dimension, limit } = this.props;
+
+    api().post('/api/v1/admin/dimensions', { keys: [dimension], start_at, end_at, limit }).then(res => {
+      this.setState({
+        loading: false,
+        data: res.data,
+      });
+    }).catch(err => {
+      console.error(err);
+    });
+  }
+
+  render () {
+    const { label, limit } = this.props;
+    const { loading, data } = this.state;
+
+    let content;
+
+    if (loading) {
+      content = (
+        <table>
+          <tbody>
+            {Array.from(Array(limit)).map((_, i) => (
+              <tr className='dimension__item' key={i}>
+                <td className='dimension__item__key'>
+                  <Skeleton width={100} />
+                </td>
+
+                <td className='dimension__item__value'>
+                  <Skeleton width={60} />
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      );
+    } else {
+      const sum = data[0].data.reduce((sum, cur) => sum + (cur.value * 1), 0);
+
+      content = (
+        <table>
+          <tbody>
+            {data[0].data.map(item => (
+              <tr className='dimension__item' key={item.key}>
+                <td className='dimension__item__key'>
+                  <span className={`dimension__item__indicator dimension__item__indicator--${roundTo10(((item.value * 1) / sum) * 100)}`} />
+                  <span title={item.key}>{item.human_key}</span>
+                </td>
+
+                <td className='dimension__item__value'>
+                  {typeof item.human_value !== 'undefined' ? item.human_value : <FormattedNumber value={item.value} />}
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      );
+    }
+
+    return (
+      <div className='dimension'>
+        <h4>{label}</h4>
+
+        {content}
+      </div>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/components/admin/Retention.js b/app/javascript/mastodon/components/admin/Retention.js
new file mode 100644
index 0000000000..aa06722f7e
--- /dev/null
+++ b/app/javascript/mastodon/components/admin/Retention.js
@@ -0,0 +1,141 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import api from 'mastodon/api';
+import { FormattedMessage, FormattedNumber, FormattedDate } from 'react-intl';
+import classNames from 'classnames';
+import { roundTo10 } from 'mastodon/utils/numbers';
+
+const dateForCohort = cohort => {
+  switch(cohort.frequency) {
+  case 'day':
+    return <FormattedDate value={cohort.period} month='long' day='2-digit' />;
+  default:
+    return <FormattedDate value={cohort.period} month='long' year='numeric' />;
+  }
+};
+
+export default class Retention extends React.PureComponent {
+
+  static propTypes = {
+    start_at: PropTypes.string,
+    end_at: PropTypes.string,
+    frequency: PropTypes.string,
+  };
+
+  state = {
+    loading: true,
+    data: null,
+  };
+
+  componentDidMount () {
+    const { start_at, end_at, frequency } = this.props;
+
+    api().post('/api/v1/admin/retention', { start_at, end_at, frequency }).then(res => {
+      this.setState({
+        loading: false,
+        data: res.data,
+      });
+    }).catch(err => {
+      console.error(err);
+    });
+  }
+
+  render () {
+    const { loading, data } = this.state;
+
+    let content;
+
+    if (loading) {
+      content = <FormattedMessage id='loading_indicator.label' defaultMessage='Loading...' />;
+    } else {
+      content = (
+        <table className='retention__table'>
+          <thead>
+            <tr>
+              <th>
+                <div className='retention__table__date retention__table__label'>
+                  <FormattedMessage id='admin.dashboard.retention.cohort' defaultMessage='Sign-up month' />
+                </div>
+              </th>
+
+              <th>
+                <div className='retention__table__number retention__table__label'>
+                  <FormattedMessage id='admin.dashboard.retention.cohort_size' defaultMessage='New users' />
+                </div>
+              </th>
+
+              {data[0].data.slice(1).map((retention, i) => (
+                <th key={retention.date}>
+                  <div className='retention__table__number retention__table__label'>
+                    {i + 1}
+                  </div>
+                </th>
+              ))}
+            </tr>
+
+            <tr>
+              <td>
+                <div className='retention__table__date retention__table__average'>
+                  <FormattedMessage id='admin.dashboard.retention.average' defaultMessage='Average' />
+                </div>
+              </td>
+
+              <td>
+                <div className='retention__table__size'>
+                  <FormattedNumber value={data.reduce((sum, cohort, i) => sum + ((cohort.data[0].value * 1) - sum) / (i + 1), 0)} maximumFractionDigits={0} />
+                </div>
+              </td>
+
+              {data[0].data.slice(1).map((retention, i) => {
+                const average = data.reduce((sum, cohort, k) => cohort.data[i + 1] ? sum + (cohort.data[i + 1].percent - sum)/(k + 1) : sum, 0);
+
+                return (
+                  <td key={retention.date}>
+                    <div className={classNames('retention__table__box', 'retention__table__average', `retention__table__box--${roundTo10(average * 100)}`)}>
+                      <FormattedNumber value={average} style='percent' />
+                    </div>
+                  </td>
+                );
+              })}
+            </tr>
+          </thead>
+
+          <tbody>
+            {data.slice(0, -1).map(cohort => (
+              <tr key={cohort.period}>
+                <td>
+                  <div className='retention__table__date'>
+                    {dateForCohort(cohort)}
+                  </div>
+                </td>
+
+                <td>
+                  <div className='retention__table__size'>
+                    <FormattedNumber value={cohort.data[0].value} />
+                  </div>
+                </td>
+
+                {cohort.data.slice(1).map(retention => (
+                  <td key={retention.date}>
+                    <div className={classNames('retention__table__box', `retention__table__box--${roundTo10(retention.percent * 100)}`)}>
+                      <FormattedNumber value={retention.percent} style='percent' />
+                    </div>
+                  </td>
+                ))}
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      );
+    }
+
+    return (
+      <div className='retention'>
+        <h4><FormattedMessage id='admin.dashboard.retention' defaultMessage='Retention' /></h4>
+
+        {content}
+      </div>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/components/admin/Trends.js b/app/javascript/mastodon/components/admin/Trends.js
new file mode 100644
index 0000000000..46307a28ad
--- /dev/null
+++ b/app/javascript/mastodon/components/admin/Trends.js
@@ -0,0 +1,73 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import api from 'mastodon/api';
+import { FormattedMessage } from 'react-intl';
+import classNames from 'classnames';
+import Hashtag from 'mastodon/components/hashtag';
+
+export default class Trends extends React.PureComponent {
+
+  static propTypes = {
+    limit: PropTypes.number.isRequired,
+  };
+
+  state = {
+    loading: true,
+    data: null,
+  };
+
+  componentDidMount () {
+    const { limit } = this.props;
+
+    api().get('/api/v1/admin/trends', { params: { limit } }).then(res => {
+      this.setState({
+        loading: false,
+        data: res.data,
+      });
+    }).catch(err => {
+      console.error(err);
+    });
+  }
+
+  render () {
+    const { limit } = this.props;
+    const { loading, data } = this.state;
+
+    let content;
+
+    if (loading) {
+      content = (
+        <div>
+          {Array.from(Array(limit)).map((_, i) => (
+            <Hashtag key={i} />
+          ))}
+        </div>
+      );
+    } else {
+      content = (
+        <div>
+          {data.map(hashtag => (
+            <Hashtag
+              key={hashtag.name}
+              name={hashtag.name}
+              href={`/admin/tags/${hashtag.id}`}
+              people={hashtag.history[0].accounts * 1 + hashtag.history[1].accounts * 1}
+              uses={hashtag.history[0].uses * 1 + hashtag.history[1].uses * 1}
+              history={hashtag.history.reverse().map(day => day.uses)}
+              className={classNames(hashtag.requires_review && 'trends__item--requires-review', !hashtag.trendable && !hashtag.requires_review && 'trends__item--disabled')}
+            />
+          ))}
+        </div>
+      );
+    }
+
+    return (
+      <div className='trends trends--compact'>
+        <h4><FormattedMessage id='trends.trending_now' defaultMessage='Trending now' /></h4>
+
+        {content}
+      </div>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/components/hashtag.js b/app/javascript/mastodon/components/hashtag.js
index 1a7edf6e0c..a793a32f54 100644
--- a/app/javascript/mastodon/components/hashtag.js
+++ b/app/javascript/mastodon/components/hashtag.js
@@ -6,6 +6,8 @@ import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import Permalink from './permalink';
 import ShortNumber from 'mastodon/components/short_number';
+import Skeleton from 'mastodon/components/skeleton';
+import classNames from 'classnames';
 
 class SilentErrorBoundary extends React.Component {
 
@@ -47,45 +49,38 @@ const accountsCountRenderer = (displayNumber, pluralReady) => (
   />
 );
 
-const Hashtag = ({ hashtag }) => (
-  <div className='trends__item'>
+export const ImmutableHashtag = ({ hashtag }) => (
+  <Hashtag
+    name={hashtag.get('name')}
+    href={hashtag.get('url')}
+    to={`/tags/${hashtag.get('name')}`}
+    people={hashtag.getIn(['history', 0, 'accounts']) * 1 + hashtag.getIn(['history', 1, 'accounts']) * 1}
+    uses={hashtag.getIn(['history', 0, 'uses']) * 1 + hashtag.getIn(['history', 1, 'uses']) * 1}
+    history={hashtag.get('history').reverse().map((day) => day.get('uses')).toArray()}
+  />
+);
+
+ImmutableHashtag.propTypes = {
+  hashtag: ImmutablePropTypes.map.isRequired,
+};
+
+const Hashtag = ({ name, href, to, people, uses, history, className }) => (
+  <div className={classNames('trends__item', className)}>
     <div className='trends__item__name'>
-      <Permalink
-        href={hashtag.get('url')}
-        to={`/tags/${hashtag.get('name')}`}
-      >
-        #<span>{hashtag.get('name')}</span>
+      <Permalink href={href} to={to}>
+        {name ? <React.Fragment>#<span>{name}</span></React.Fragment> : <Skeleton width={50} />}
       </Permalink>
 
-      <ShortNumber
-        value={
-          hashtag.getIn(['history', 0, 'accounts']) * 1 +
-          hashtag.getIn(['history', 1, 'accounts']) * 1
-        }
-        renderer={accountsCountRenderer}
-      />
+      {typeof people !== 'undefined' ? <ShortNumber value={people} renderer={accountsCountRenderer} /> : <Skeleton width={100} />}
     </div>
 
     <div className='trends__item__current'>
-      <ShortNumber
-        value={
-          hashtag.getIn(['history', 0, 'uses']) * 1 +
-          hashtag.getIn(['history', 1, 'uses']) * 1
-        }
-      />
+      {typeof uses !== 'undefined' ? <ShortNumber value={uses} /> : <Skeleton width={42} height={36} />}
     </div>
 
     <div className='trends__item__sparkline'>
       <SilentErrorBoundary>
-        <Sparklines
-          width={50}
-          height={28}
-          data={hashtag
-            .get('history')
-            .reverse()
-            .map((day) => day.get('uses'))
-            .toArray()}
-        >
+        <Sparklines width={50} height={28} data={history ? history : Array.from(Array(7)).map(() => 0)}>
           <SparklinesCurve style={{ fill: 'none' }} />
         </Sparklines>
       </SilentErrorBoundary>
@@ -94,7 +89,13 @@ const Hashtag = ({ hashtag }) => (
 );
 
 Hashtag.propTypes = {
-  hashtag: ImmutablePropTypes.map.isRequired,
+  name: PropTypes.string,
+  href: PropTypes.string,
+  to: PropTypes.string,
+  people: PropTypes.number,
+  uses: PropTypes.number,
+  history: PropTypes.arrayOf(PropTypes.number),
+  className: PropTypes.string,
 };
 
 export default Hashtag;
diff --git a/app/javascript/mastodon/components/skeleton.js b/app/javascript/mastodon/components/skeleton.js
new file mode 100644
index 0000000000..09093e99c7
--- /dev/null
+++ b/app/javascript/mastodon/components/skeleton.js
@@ -0,0 +1,11 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const Skeleton = ({ width, height }) => <span className='skeleton' style={{ width, height }}>&zwnj;</span>;
+
+Skeleton.propTypes = {
+  width: PropTypes.number,
+  height: PropTypes.number,
+};
+
+export default Skeleton;
diff --git a/app/javascript/mastodon/containers/admin_component.js b/app/javascript/mastodon/containers/admin_component.js
new file mode 100644
index 0000000000..816b44bd17
--- /dev/null
+++ b/app/javascript/mastodon/containers/admin_component.js
@@ -0,0 +1,26 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { IntlProvider, addLocaleData } from 'react-intl';
+import { getLocale } from '../locales';
+
+const { localeData, messages } = getLocale();
+addLocaleData(localeData);
+
+export default class AdminComponent extends React.PureComponent {
+
+  static propTypes = {
+    locale: PropTypes.string.isRequired,
+    children: PropTypes.node.isRequired,
+  };
+
+  render () {
+    const { locale, children } = this.props;
+
+    return (
+      <IntlProvider locale={locale} messages={messages}>
+        {children}
+      </IntlProvider>
+    );
+  }
+
+}
diff --git a/app/javascript/mastodon/containers/media_container.js b/app/javascript/mastodon/containers/media_container.js
index 52fdc9294b..2f42a084fd 100644
--- a/app/javascript/mastodon/containers/media_container.js
+++ b/app/javascript/mastodon/containers/media_container.js
@@ -7,7 +7,7 @@ import { getLocale } from 'mastodon/locales';
 import { getScrollbarWidth } from 'mastodon/utils/scrollbar';
 import MediaGallery from 'mastodon/components/media_gallery';
 import Poll from 'mastodon/components/poll';
-import Hashtag from 'mastodon/components/hashtag';
+import { ImmutableHashtag as Hashtag } from 'mastodon/components/hashtag';
 import ModalRoot from 'mastodon/components/modal_root';
 import MediaModal from 'mastodon/features/ui/components/media_modal';
 import Video from 'mastodon/features/video';
diff --git a/app/javascript/mastodon/features/compose/components/search_results.js b/app/javascript/mastodon/features/compose/components/search_results.js
index 958a65286b..9b3d01cfd2 100644
--- a/app/javascript/mastodon/features/compose/components/search_results.js
+++ b/app/javascript/mastodon/features/compose/components/search_results.js
@@ -5,7 +5,7 @@ import { FormattedMessage, defineMessages, injectIntl } from 'react-intl';
 import AccountContainer from '../../../containers/account_container';
 import StatusContainer from '../../../containers/status_container';
 import ImmutablePureComponent from 'react-immutable-pure-component';
-import Hashtag from '../../../components/hashtag';
+import { ImmutableHashtag as Hashtag } from '../../../components/hashtag';
 import Icon from 'mastodon/components/icon';
 import { searchEnabled } from '../../../initial_state';
 import LoadMore from 'mastodon/components/load_more';
diff --git a/app/javascript/mastodon/features/getting_started/components/trends.js b/app/javascript/mastodon/features/getting_started/components/trends.js
index 3b9a3075fb..71c7c458dc 100644
--- a/app/javascript/mastodon/features/getting_started/components/trends.js
+++ b/app/javascript/mastodon/features/getting_started/components/trends.js
@@ -2,7 +2,7 @@ import React from 'react';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
-import Hashtag from 'mastodon/components/hashtag';
+import { ImmutableHashtag as Hashtag } from 'mastodon/components/hashtag';
 import { FormattedMessage } from 'react-intl';
 
 export default class Trends extends ImmutablePureComponent {
diff --git a/app/javascript/mastodon/utils/numbers.js b/app/javascript/mastodon/utils/numbers.js
index 6f2505cae8..6ef563ad8f 100644
--- a/app/javascript/mastodon/utils/numbers.js
+++ b/app/javascript/mastodon/utils/numbers.js
@@ -69,3 +69,11 @@ export function pluralReady(sourceNumber, division) {
 
   return Math.trunc(sourceNumber / closestScale) * closestScale;
 }
+
+/**
+ * @param {number} num
+ * @returns {number}
+ */
+export function roundTo10(num) {
+  return Math.round(num * 0.1) / 0.1;
+}
diff --git a/app/javascript/packs/admin.js b/app/javascript/packs/admin.js
index 8fd1b8a8ed..f32679619d 100644
--- a/app/javascript/packs/admin.js
+++ b/app/javascript/packs/admin.js
@@ -99,4 +99,24 @@ ready(() => {
 
   const registrationMode = document.getElementById('form_admin_settings_registrations_mode');
   if (registrationMode) onChangeRegistrationMode(registrationMode);
+
+  const React    = require('react');
+  const ReactDOM = require('react-dom');
+
+  [].forEach.call(document.querySelectorAll('[data-admin-component]'), element => {
+    const componentName  = element.getAttribute('data-admin-component');
+    const { locale, ...componentProps } = JSON.parse(element.getAttribute('data-props'));
+
+    import('../mastodon/containers/admin_component').then(({ default: AdminComponent }) => {
+      return import('../mastodon/components/admin/' + componentName).then(({ default: Component }) => {
+        ReactDOM.render((
+          <AdminComponent locale={locale}>
+            <Component {...componentProps} />
+          </AdminComponent>
+        ), element);
+      });
+    }).catch(error => {
+      console.error(error);
+    });
+  });
 });
diff --git a/app/javascript/styles/mastodon/admin.scss b/app/javascript/styles/mastodon/admin.scss
index 25ebc19b09..e903fea56a 100644
--- a/app/javascript/styles/mastodon/admin.scss
+++ b/app/javascript/styles/mastodon/admin.scss
@@ -1,3 +1,5 @@
+@use "sass:math";
+
 $no-columns-breakpoint: 600px;
 $sidebar-width: 240px;
 $content-width: 840px;
@@ -909,10 +911,197 @@ a.name-tag,
   }
 }
 
+.dashboard__counters.admin-account-counters {
+  margin-top: 10px;
+}
+
 .account-badges {
   margin: -2px 0;
 }
 
-.dashboard__counters.admin-account-counters {
-  margin-top: 10px;
+.retention {
+  &__table {
+    &__number {
+      color: $secondary-text-color;
+      padding: 10px;
+    }
+
+    &__date {
+      white-space: nowrap;
+      padding: 10px 0;
+      text-align: left;
+      min-width: 120px;
+
+      &.retention__table__average {
+        font-weight: 700;
+      }
+    }
+
+    &__size {
+      text-align: center;
+      padding: 10px;
+    }
+
+    &__label {
+      font-weight: 700;
+      color: $darker-text-color;
+    }
+
+    &__box {
+      box-sizing: border-box;
+      background: $ui-highlight-color;
+      padding: 10px;
+      font-weight: 500;
+      color: $primary-text-color;
+      width: 52px;
+      margin: 1px;
+
+      @for $i from 0 through 10 {
+        &--#{10 * $i} {
+          background-color: rgba($ui-highlight-color, 1 * (math.div(max(1, $i), 10)));
+        }
+      }
+    }
+  }
+}
+
+.sparkline {
+  display: block;
+  text-decoration: none;
+  background: lighten($ui-base-color, 4%);
+  border-radius: 4px;
+  padding: 0;
+  position: relative;
+  padding-bottom: 55px + 20px;
+  overflow: hidden;
+
+  &__value {
+    display: flex;
+    line-height: 33px;
+    align-items: flex-end;
+    padding: 20px;
+    padding-bottom: 10px;
+
+    &__total {
+      display: block;
+      margin-right: 10px;
+      font-weight: 500;
+      font-size: 28px;
+      color: $primary-text-color;
+    }
+
+    &__change {
+      display: block;
+      font-weight: 500;
+      font-size: 18px;
+      color: $darker-text-color;
+      margin-bottom: -3px;
+
+      &.positive {
+        color: $valid-value-color;
+      }
+
+      &.negative {
+        color: $error-value-color;
+      }
+    }
+  }
+
+  &__label {
+    padding: 0 20px;
+    padding-bottom: 10px;
+    text-transform: uppercase;
+    color: $darker-text-color;
+    font-weight: 500;
+  }
+
+  &__graph {
+    position: absolute;
+    bottom: 0;
+
+    svg {
+      display: block;
+      margin: 0;
+    }
+
+    path:first-child {
+      fill: rgba($highlight-text-color, 0.25) !important;
+      fill-opacity: 1 !important;
+    }
+
+    path:last-child {
+      stroke: lighten($highlight-text-color, 6%) !important;
+      fill: none !important;
+    }
+  }
+}
+
+a.sparkline {
+  &:hover,
+  &:focus,
+  &:active {
+    background: lighten($ui-base-color, 6%);
+  }
+}
+
+.skeleton {
+  background-color: lighten($ui-base-color, 8%);
+  background-image: linear-gradient(90deg, lighten($ui-base-color, 8%), lighten($ui-base-color, 12%), lighten($ui-base-color, 8%));
+  background-size: 200px 100%;
+  background-repeat: no-repeat;
+  border-radius: 4px;
+  display: inline-block;
+  line-height: 1;
+  width: 100%;
+  animation: skeleton 1.2s ease-in-out infinite;
+}
+
+@keyframes skeleton {
+  0% {
+    background-position: -200px 0;
+  }
+
+  100% {
+    background-position: calc(200px + 100%) 0;
+  }
+}
+
+.dimension {
+  table {
+    width: 100%;
+  }
+
+  &__item {
+    border-bottom: 1px solid lighten($ui-base-color, 4%);
+
+    &__key {
+      font-weight: 500;
+      padding: 11px 10px;
+    }
+
+    &__value {
+      text-align: right;
+      color: $darker-text-color;
+      padding: 11px 10px;
+    }
+
+    &__indicator {
+      display: inline-block;
+      width: 8px;
+      height: 8px;
+      border-radius: 50%;
+      background: $ui-highlight-color;
+      margin-right: 10px;
+
+      @for $i from 0 through 10 {
+        &--#{10 * $i} {
+          background-color: rgba($ui-highlight-color, 1 * (math.div(max(1, $i), 10)));
+        }
+      }
+    }
+
+    &:last-child {
+      border-bottom: 0;
+    }
+  }
 }
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 29e2a4f42d..ed0709b44f 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -6955,7 +6955,6 @@ noscript {
     &__current {
       flex: 0 0 auto;
       font-size: 24px;
-      line-height: 36px;
       font-weight: 500;
       text-align: right;
       padding-right: 15px;
@@ -6977,6 +6976,58 @@ noscript {
         fill: none !important;
       }
     }
+
+    &--requires-review {
+      .trends__item__name {
+        color: $gold-star;
+
+        a {
+          color: $gold-star;
+        }
+      }
+
+      .trends__item__current {
+        color: $gold-star;
+      }
+
+      .trends__item__sparkline {
+        path:first-child {
+          fill: rgba($gold-star, 0.25) !important;
+        }
+
+        path:last-child {
+          stroke: lighten($gold-star, 6%) !important;
+        }
+      }
+    }
+
+    &--disabled {
+      .trends__item__name {
+        color: lighten($ui-base-color, 12%);
+
+        a {
+          color: lighten($ui-base-color, 12%);
+        }
+      }
+
+      .trends__item__current {
+        color: lighten($ui-base-color, 12%);
+      }
+
+      .trends__item__sparkline {
+        path:first-child {
+          fill: rgba(lighten($ui-base-color, 12%), 0.25) !important;
+        }
+
+        path:last-child {
+          stroke: lighten(lighten($ui-base-color, 12%), 6%) !important;
+        }
+      }
+    }
+  }
+
+  &--compact &__item {
+    padding: 10px;
   }
 }
 
diff --git a/app/javascript/styles/mastodon/dashboard.scss b/app/javascript/styles/mastodon/dashboard.scss
index c0944d417d..cad5a105be 100644
--- a/app/javascript/styles/mastodon/dashboard.scss
+++ b/app/javascript/styles/mastodon/dashboard.scss
@@ -56,23 +56,56 @@
   }
 }
 
-.dashboard__widgets {
-  display: flex;
-  flex-wrap: wrap;
-  margin: 0 -5px;
+.dashboard {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
+  grid-gap: 10px;
 
-  & > div {
-    flex: 0 0 33.333%;
-    margin-bottom: 20px;
+  &__item {
+    &--span-double-column {
+      grid-column: span 2;
+    }
 
-    & > div {
-      padding: 0 5px;
+    &--span-double-row {
+      grid-row: span 2;
+    }
+
+    h4 {
+      padding-top: 20px;
     }
   }
 
-  a:not(.name-tag) {
-    color: $ui-secondary-color;
-    font-weight: 500;
+  &__quick-access {
+    display: flex;
+    align-items: baseline;
+    border-radius: 4px;
+    background: $ui-highlight-color;
+    color: $primary-text-color;
+    transition: all 100ms ease-in;
+    font-size: 14px;
+    padding: 0 16px;
+    line-height: 36px;
+    height: 36px;
     text-decoration: none;
+    margin-bottom: 4px;
+
+    &:active,
+    &:focus,
+    &:hover {
+      background-color: lighten($ui-highlight-color, 10%);
+      transition: all 200ms ease-out;
+    }
+
+    span {
+      flex: 1 1 auto;
+    }
+
+    .fa {
+      flex: 0 0 auto;
+    }
+
+    strong {
+      font-weight: 700;
+    }
   }
 }
diff --git a/app/lib/activity_tracker.rb b/app/lib/activity_tracker.rb
index 81303b7158..6d3401b37b 100644
--- a/app/lib/activity_tracker.rb
+++ b/app/lib/activity_tracker.rb
@@ -1,29 +1,73 @@
 # frozen_string_literal: true
 
 class ActivityTracker
+  include Redisable
+
   EXPIRE_AFTER = 6.months.seconds
 
+  def initialize(prefix, type)
+    @prefix = prefix
+    @type   = type
+  end
+
+  def add(value = 1, at_time = Time.now.utc)
+    key = key_at(at_time)
+
+    case @type
+    when :basic
+      redis.incrby(key, value)
+    when :unique
+      redis.pfadd(key, value)
+    end
+
+    redis.expire(key, EXPIRE_AFTER)
+  end
+
+  def get(start_at, end_at = Time.now.utc)
+    (start_at.to_date...end_at.to_date).map do |date|
+      key = key_at(date.to_time(:utc))
+
+      value = begin
+        case @type
+        when :basic
+          redis.get(key).to_i
+        when :unique
+          redis.pfcount(key)
+        end
+      end
+
+      [date, value]
+    end
+  end
+
+  def sum(start_at, end_at = Time.now.utc)
+    keys = (start_at.to_date...end_at.to_date).flat_map { |date| [key_at(date.to_time(:utc)), legacy_key_at(date)] }.uniq
+
+    case @type
+    when :basic
+      redis.mget(*keys).map(&:to_i).sum
+    when :unique
+      redis.pfcount(*keys)
+    end
+  end
+
   class << self
-    include Redisable
-
     def increment(prefix)
-      key = [prefix, current_week].join(':')
-
-      redis.incrby(key, 1)
-      redis.expire(key, EXPIRE_AFTER)
+      new(prefix, :basic).add
     end
 
     def record(prefix, value)
-      key = [prefix, current_week].join(':')
-
-      redis.pfadd(key, value)
-      redis.expire(key, EXPIRE_AFTER)
-    end
-
-    private
-
-    def current_week
-      Time.zone.today.cweek
+      new(prefix, :unique).add(value)
     end
   end
+
+  private
+
+  def key_at(at_time)
+    "#{@prefix}:#{at_time.beginning_of_day.to_i}"
+  end
+
+  def legacy_key_at(at_time)
+    "#{@prefix}:#{at_time.to_date.cweek}"
+  end
 end
diff --git a/app/lib/admin/metrics/dimension.rb b/app/lib/admin/metrics/dimension.rb
new file mode 100644
index 0000000000..279539f686
--- /dev/null
+++ b/app/lib/admin/metrics/dimension.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension
+  DIMENSIONS = {
+    languages: Admin::Metrics::Dimension::LanguagesDimension,
+    sources: Admin::Metrics::Dimension::SourcesDimension,
+    servers: Admin::Metrics::Dimension::ServersDimension,
+    space_usage: Admin::Metrics::Dimension::SpaceUsageDimension,
+    software_versions: Admin::Metrics::Dimension::SoftwareVersionsDimension,
+  }.freeze
+
+  def self.retrieve(dimension_keys, start_at, end_at, limit)
+    Array(dimension_keys).map { |key| DIMENSIONS[key.to_sym]&.new(start_at, end_at, limit) }.compact
+  end
+end
diff --git a/app/lib/admin/metrics/dimension/base_dimension.rb b/app/lib/admin/metrics/dimension/base_dimension.rb
new file mode 100644
index 0000000000..8ed8d7683a
--- /dev/null
+++ b/app/lib/admin/metrics/dimension/base_dimension.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension::BaseDimension
+  def initialize(start_at, end_at, limit)
+    @start_at = start_at&.to_datetime
+    @end_at   = end_at&.to_datetime
+    @limit    = limit&.to_i
+  end
+
+  def key
+    raise NotImplementedError
+  end
+
+  def data
+    raise NotImplementedError
+  end
+
+  def self.model_name
+    self.class.name
+  end
+
+  def read_attribute_for_serialization(key)
+    send(key) if respond_to?(key)
+  end
+
+  protected
+
+  def time_period
+    (@start_at...@end_at)
+  end
+end
diff --git a/app/lib/admin/metrics/dimension/languages_dimension.rb b/app/lib/admin/metrics/dimension/languages_dimension.rb
new file mode 100644
index 0000000000..2d0ac124e0
--- /dev/null
+++ b/app/lib/admin/metrics/dimension/languages_dimension.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension::LanguagesDimension < Admin::Metrics::Dimension::BaseDimension
+  def key
+    'languages'
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT locale, count(*) AS value
+      FROM users
+      WHERE current_sign_in_at BETWEEN $1 AND $2
+        AND locale IS NOT NULL
+      GROUP BY locale
+      ORDER BY count(*) DESC
+      LIMIT $3
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at], [nil, @limit]])
+
+    rows.map { |row| { key: row['locale'], human_key: SettingsHelper::HUMAN_LOCALES[row['locale'].to_sym], value: row['value'].to_s } }
+  end
+end
diff --git a/app/lib/admin/metrics/dimension/servers_dimension.rb b/app/lib/admin/metrics/dimension/servers_dimension.rb
new file mode 100644
index 0000000000..3e80b66250
--- /dev/null
+++ b/app/lib/admin/metrics/dimension/servers_dimension.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension::ServersDimension < Admin::Metrics::Dimension::BaseDimension
+  def key
+    'servers'
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT accounts.domain, count(*) AS value
+      FROM statuses
+      INNER JOIN accounts ON accounts.id = statuses.account_id
+      WHERE statuses.id BETWEEN $1 AND $2
+      GROUP BY accounts.domain
+      ORDER BY count(*) DESC
+      LIMIT $3
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, Mastodon::Snowflake.id_at(@start_at)], [nil, Mastodon::Snowflake.id_at(@end_at)], [nil, @limit]])
+
+    rows.map { |row| { key: row['domain'] || Rails.configuration.x.local_domain, human_key: row['domain'] || Rails.configuration.x.local_domain, value: row['value'].to_s } }
+  end
+end
diff --git a/app/lib/admin/metrics/dimension/software_versions_dimension.rb b/app/lib/admin/metrics/dimension/software_versions_dimension.rb
new file mode 100644
index 0000000000..34917404d1
--- /dev/null
+++ b/app/lib/admin/metrics/dimension/software_versions_dimension.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension::SoftwareVersionsDimension < Admin::Metrics::Dimension::BaseDimension
+  include Redisable
+
+  def key
+    'software_versions'
+  end
+
+  def data
+    [mastodon_version, ruby_version, postgresql_version, redis_version]
+  end
+
+  private
+
+  def mastodon_version
+    value = Mastodon::Version.to_s
+
+    {
+      key: 'mastodon',
+      human_key: 'Mastodon',
+      value: value,
+      human_value: value,
+    }
+  end
+
+  def ruby_version
+    value = "#{RUBY_VERSION}p#{RUBY_PATCHLEVEL}"
+
+    {
+      key: 'ruby',
+      human_key: 'Ruby',
+      value: value,
+      human_value: value,
+    }
+  end
+
+  def postgresql_version
+    value = ActiveRecord::Base.connection.execute('SELECT VERSION()').first['version'].match(/\A(?:PostgreSQL |)([^\s]+).*\z/)[1]
+
+    {
+      key: 'postgresql',
+      human_key: 'PostgreSQL',
+      value: value,
+      human_value: value,
+    }
+  end
+
+  def redis_version
+    value = redis_info['redis_version']
+
+    {
+      key: 'redis',
+      human_key: 'Redis',
+      value: value,
+      human_value: value,
+    }
+  end
+
+  def redis_info
+    @redis_info ||= begin
+      if redis.is_a?(Redis::Namespace)
+        redis.redis.info
+      else
+        redis.info
+      end
+    end
+  end
+end
diff --git a/app/lib/admin/metrics/dimension/sources_dimension.rb b/app/lib/admin/metrics/dimension/sources_dimension.rb
new file mode 100644
index 0000000000..a9f061809c
--- /dev/null
+++ b/app/lib/admin/metrics/dimension/sources_dimension.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension::SourcesDimension < Admin::Metrics::Dimension::BaseDimension
+  def key
+    'sources'
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT oauth_applications.name, count(*) AS value
+      FROM users
+      LEFT JOIN oauth_applications ON oauth_applications.id = users.created_by_application_id
+      WHERE users.created_at BETWEEN $1 AND $2
+      GROUP BY oauth_applications.name
+      ORDER BY count(*) DESC
+      LIMIT $3
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at], [nil, @limit]])
+
+    rows.map { |row| { key: row['name'] || 'web', human_key: row['name'] || I18n.t('admin.dashboard.website'), value: row['value'].to_s } }
+  end
+end
diff --git a/app/lib/admin/metrics/dimension/space_usage_dimension.rb b/app/lib/admin/metrics/dimension/space_usage_dimension.rb
new file mode 100644
index 0000000000..aa00a2e18b
--- /dev/null
+++ b/app/lib/admin/metrics/dimension/space_usage_dimension.rb
@@ -0,0 +1,70 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Dimension::SpaceUsageDimension < Admin::Metrics::Dimension::BaseDimension
+  include Redisable
+  include ActionView::Helpers::NumberHelper
+
+  def key
+    'space_usage'
+  end
+
+  def data
+    [postgresql_size, redis_size, media_size]
+  end
+
+  private
+
+  def postgresql_size
+    value = ActiveRecord::Base.connection.execute('SELECT pg_database_size(current_database())').first['pg_database_size']
+
+    {
+      key: 'postgresql',
+      human_key: 'PostgreSQL',
+      value: value.to_s,
+      unit: 'bytes',
+      human_value: number_to_human_size(value),
+    }
+  end
+
+  def redis_size
+    value = redis_info['used_memory']
+
+    {
+      key: 'redis',
+      human_key: 'Redis',
+      value: value.to_s,
+      unit: 'bytes',
+      human_value: number_to_human_size(value),
+    }
+  end
+
+  def media_size
+    value = [
+      MediaAttachment.sum(Arel.sql('COALESCE(file_file_size, 0) + COALESCE(thumbnail_file_size, 0)')),
+      CustomEmoji.sum(:image_file_size),
+      PreviewCard.sum(:image_file_size),
+      Account.sum(Arel.sql('COALESCE(avatar_file_size, 0) + COALESCE(header_file_size, 0)')),
+      Backup.sum(:dump_file_size),
+      Import.sum(:data_file_size),
+      SiteUpload.sum(:file_file_size),
+    ].sum
+
+    {
+      key: 'media',
+      human_key: I18n.t('admin.dashboard.media_storage'),
+      value: value.to_s,
+      unit: 'bytes',
+      human_value: number_to_human_size(value),
+    }
+  end
+
+  def redis_info
+    @redis_info ||= begin
+      if redis.is_a?(Redis::Namespace)
+        redis.redis.info
+      else
+        redis.info
+      end
+    end
+  end
+end
diff --git a/app/lib/admin/metrics/measure.rb b/app/lib/admin/metrics/measure.rb
new file mode 100644
index 0000000000..5cebf0331e
--- /dev/null
+++ b/app/lib/admin/metrics/measure.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure
+  MEASURES = {
+    active_users: Admin::Metrics::Measure::ActiveUsersMeasure,
+    new_users: Admin::Metrics::Measure::NewUsersMeasure,
+    interactions: Admin::Metrics::Measure::InteractionsMeasure,
+    opened_reports: Admin::Metrics::Measure::OpenedReportsMeasure,
+    resolved_reports: Admin::Metrics::Measure::ResolvedReportsMeasure,
+  }.freeze
+
+  def self.retrieve(measure_keys, start_at, end_at)
+    Array(measure_keys).map { |key| MEASURES[key.to_sym]&.new(start_at, end_at) }.compact
+  end
+end
diff --git a/app/lib/admin/metrics/measure/active_users_measure.rb b/app/lib/admin/metrics/measure/active_users_measure.rb
new file mode 100644
index 0000000000..ac022eb9d1
--- /dev/null
+++ b/app/lib/admin/metrics/measure/active_users_measure.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::ActiveUsersMeasure < Admin::Metrics::Measure::BaseMeasure
+  def key
+    'active_users'
+  end
+
+  def total
+    activity_tracker.sum(time_period.first, time_period.last)
+  end
+
+  def previous_total
+    activity_tracker.sum(previous_time_period.first, previous_time_period.last)
+  end
+
+  def data
+    activity_tracker.get(time_period.first, time_period.last).map { |date, value| { date: date.to_time(:utc).iso8601, value: value.to_s } }
+  end
+
+  protected
+
+  def activity_tracker
+    @activity_tracker ||= ActivityTracker.new('activity:logins', :unique)
+  end
+
+  def time_period
+    (@start_at.to_date...@end_at.to_date)
+  end
+
+  def previous_time_period
+    ((@start_at.to_date - length_of_period)...(@end_at.to_date - length_of_period))
+  end
+end
diff --git a/app/lib/admin/metrics/measure/base_measure.rb b/app/lib/admin/metrics/measure/base_measure.rb
new file mode 100644
index 0000000000..4c336a69e6
--- /dev/null
+++ b/app/lib/admin/metrics/measure/base_measure.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::BaseMeasure
+  def initialize(start_at, end_at)
+    @start_at = start_at&.to_datetime
+    @end_at   = end_at&.to_datetime
+  end
+
+  def key
+    raise NotImplementedError
+  end
+
+  def total
+    raise NotImplementedError
+  end
+
+  def previous_total
+    raise NotImplementedError
+  end
+
+  def data
+    raise NotImplementedError
+  end
+
+  def self.model_name
+    self.class.name
+  end
+
+  def read_attribute_for_serialization(key)
+    send(key) if respond_to?(key)
+  end
+
+  protected
+
+  def time_period
+    (@start_at...@end_at)
+  end
+
+  def previous_time_period
+    ((@start_at - length_of_period)...(@end_at - length_of_period))
+  end
+
+  def length_of_period
+    @length_of_period ||= @end_at - @start_at
+  end
+end
diff --git a/app/lib/admin/metrics/measure/interactions_measure.rb b/app/lib/admin/metrics/measure/interactions_measure.rb
new file mode 100644
index 0000000000..9a4ef6d637
--- /dev/null
+++ b/app/lib/admin/metrics/measure/interactions_measure.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::InteractionsMeasure < Admin::Metrics::Measure::BaseMeasure
+  def key
+    'interactions'
+  end
+
+  def total
+    activity_tracker.sum(time_period.first, time_period.last)
+  end
+
+  def previous_total
+    activity_tracker.sum(previous_time_period.first, previous_time_period.last)
+  end
+
+  def data
+    activity_tracker.get(time_period.first, time_period.last).map { |date, value| { date: date.to_time(:utc).iso8601, value: value.to_s } }
+  end
+
+  protected
+
+  def activity_tracker
+    @activity_tracker ||= ActivityTracker.new('activity:interactions', :basic)
+  end
+
+  def time_period
+    (@start_at.to_date...@end_at.to_date)
+  end
+
+  def previous_time_period
+    ((@start_at.to_date - length_of_period)...(@end_at.to_date - length_of_period))
+  end
+end
diff --git a/app/lib/admin/metrics/measure/new_users_measure.rb b/app/lib/admin/metrics/measure/new_users_measure.rb
new file mode 100644
index 0000000000..b31679ad3a
--- /dev/null
+++ b/app/lib/admin/metrics/measure/new_users_measure.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::NewUsersMeasure < Admin::Metrics::Measure::BaseMeasure
+  def key
+    'new_users'
+  end
+
+  def total
+    User.where(created_at: time_period).count
+  end
+
+  def previous_total
+    User.where(created_at: previous_time_period).count
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT axis.*, (
+        WITH new_users AS (
+          SELECT users.id
+          FROM users
+          WHERE date_trunc('day', users.created_at)::date = axis.period
+        )
+        SELECT count(*) FROM new_users
+      ) AS value
+      FROM (
+        SELECT generate_series(date_trunc('day', $1::timestamp)::date, date_trunc('day', $2::timestamp)::date, interval '1 day') AS period
+      ) AS axis
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at]])
+
+    rows.map { |row| { date: row['period'], value: row['value'].to_s } }
+  end
+end
diff --git a/app/lib/admin/metrics/measure/opened_reports_measure.rb b/app/lib/admin/metrics/measure/opened_reports_measure.rb
new file mode 100644
index 0000000000..9acc2c33db
--- /dev/null
+++ b/app/lib/admin/metrics/measure/opened_reports_measure.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::OpenedReportsMeasure < Admin::Metrics::Measure::BaseMeasure
+  def key
+    'opened_reports'
+  end
+
+  def total
+    Report.where(created_at: time_period).count
+  end
+
+  def previous_total
+    Report.where(created_at: previous_time_period).count
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT axis.*, (
+        WITH new_reports AS (
+          SELECT reports.id
+          FROM reports
+          WHERE date_trunc('day', reports.created_at)::date = axis.period
+        )
+        SELECT count(*) FROM new_reports
+      ) AS value
+      FROM (
+        SELECT generate_series(date_trunc('day', $1::timestamp)::date, date_trunc('day', $2::timestamp)::date, interval '1 day') AS period
+      ) AS axis
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at]])
+
+    rows.map { |row| { date: row['period'], value: row['value'].to_s } }
+  end
+end
diff --git a/app/lib/admin/metrics/measure/resolved_reports_measure.rb b/app/lib/admin/metrics/measure/resolved_reports_measure.rb
new file mode 100644
index 0000000000..0dcecbbad6
--- /dev/null
+++ b/app/lib/admin/metrics/measure/resolved_reports_measure.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Measure::ResolvedReportsMeasure < Admin::Metrics::Measure::BaseMeasure
+  def key
+    'resolved_reports'
+  end
+
+  def total
+    Report.resolved.where(updated_at: time_period).count
+  end
+
+  def previous_total
+    Report.resolved.where(updated_at: previous_time_period).count
+  end
+
+  def data
+    sql = <<-SQL.squish
+      SELECT axis.*, (
+        WITH resolved_reports AS (
+          SELECT reports.id
+          FROM reports
+          WHERE action_taken
+            AND date_trunc('day', reports.updated_at)::date = axis.period
+        )
+        SELECT count(*) FROM resolved_reports
+      ) AS value
+      FROM (
+        SELECT generate_series(date_trunc('day', $1::timestamp)::date, date_trunc('day', $2::timestamp)::date, interval '1 day') AS period
+      ) AS axis
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at]])
+
+    rows.map { |row| { date: row['period'], value: row['value'].to_s } }
+  end
+end
diff --git a/app/lib/admin/metrics/retention.rb b/app/lib/admin/metrics/retention.rb
new file mode 100644
index 0000000000..49ab891293
--- /dev/null
+++ b/app/lib/admin/metrics/retention.rb
@@ -0,0 +1,67 @@
+# frozen_string_literal: true
+
+class Admin::Metrics::Retention
+  class Cohort < ActiveModelSerializers::Model
+    attributes :period, :frequency, :data
+  end
+
+  class CohortData < ActiveModelSerializers::Model
+    attributes :date, :percent, :value
+  end
+
+  def initialize(start_at, end_at, frequency)
+    @start_at  = start_at&.to_date
+    @end_at    = end_at&.to_date
+    @frequency = %w(day month).include?(frequency) ? frequency : 'day'
+  end
+
+  def cohorts
+    sql = <<-SQL.squish
+      SELECT axis.*, (
+        WITH new_users AS (
+          SELECT users.id
+          FROM users
+          WHERE date_trunc($3, users.created_at)::date = axis.cohort_period
+        ),
+        retained_users AS (
+          SELECT users.id
+          FROM users
+          INNER JOIN new_users on new_users.id = users.id
+          WHERE date_trunc($3, users.current_sign_in_at) >= axis.retention_period
+        )
+        SELECT ARRAY[count(*), (count(*) + 1)::float / (SELECT count(*) + 1 FROM new_users)] AS retention_value_and_percent
+        FROM retained_users
+      )
+      FROM (
+        WITH cohort_periods AS (
+          SELECT generate_series(date_trunc($3, $1::timestamp)::date, date_trunc($3, $2::timestamp)::date, ('1 ' || $3)::interval) AS cohort_period
+        ),
+        retention_periods AS (
+          SELECT cohort_period AS retention_period FROM cohort_periods
+        )
+        SELECT *
+        FROM cohort_periods, retention_periods
+        WHERE retention_period >= cohort_period
+      ) as axis
+    SQL
+
+    rows = ActiveRecord::Base.connection.select_all(sql, nil, [[nil, @start_at], [nil, @end_at], [nil, @frequency]])
+
+    rows.each_with_object([]) do |row, arr|
+      current_cohort = arr.last
+
+      if current_cohort.nil? || current_cohort.period != row['cohort_period']
+        current_cohort = Cohort.new(period: row['cohort_period'], frequency: @frequency, data: [])
+        arr << current_cohort
+      end
+
+      value, percent = row['retention_value_and_percent'].delete('{}').split(',')
+
+      current_cohort.data << CohortData.new(
+        date: row['retention_period'],
+        percent: percent.to_f,
+        value: value.to_s
+      )
+    end
+  end
+end
diff --git a/app/presenters/instance_presenter.rb b/app/presenters/instance_presenter.rb
index 8cd774abe8..3e85faa924 100644
--- a/app/presenters/instance_presenter.rb
+++ b/app/presenters/instance_presenter.rb
@@ -24,8 +24,8 @@ class InstancePresenter
     Rails.cache.fetch('user_count') { User.confirmed.joins(:account).merge(Account.without_suspended).count }
   end
 
-  def active_user_count(weeks = 4)
-    Rails.cache.fetch("active_user_count/#{weeks}") { Redis.current.pfcount(*(0...weeks).map { |i| "activity:logins:#{i.weeks.ago.utc.to_date.cweek}" }) }
+  def active_user_count(num_weeks = 4)
+    Rails.cache.fetch("active_user_count/#{num_weeks}") { ActivityTracker.new('activity:logins', :unique).sum(num_weeks.weeks.ago) }
   end
 
   def status_count
diff --git a/app/serializers/rest/admin/cohort_serializer.rb b/app/serializers/rest/admin/cohort_serializer.rb
new file mode 100644
index 0000000000..56b35c6991
--- /dev/null
+++ b/app/serializers/rest/admin/cohort_serializer.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class REST::Admin::CohortSerializer < ActiveModel::Serializer
+  attributes :period, :frequency
+
+  class CohortDataSerializer < ActiveModel::Serializer
+    attributes :date, :percent, :value
+
+    def date
+      object.date.iso8601
+    end
+  end
+
+  has_many :data, serializer: CohortDataSerializer
+
+  def period
+    object.period.iso8601
+  end
+end
diff --git a/app/serializers/rest/admin/dimension_serializer.rb b/app/serializers/rest/admin/dimension_serializer.rb
new file mode 100644
index 0000000000..a00b6ecd7e
--- /dev/null
+++ b/app/serializers/rest/admin/dimension_serializer.rb
@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class REST::Admin::DimensionSerializer < ActiveModel::Serializer
+  attributes :key, :data
+end
diff --git a/app/serializers/rest/admin/measure_serializer.rb b/app/serializers/rest/admin/measure_serializer.rb
new file mode 100644
index 0000000000..81d655c1a9
--- /dev/null
+++ b/app/serializers/rest/admin/measure_serializer.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class REST::Admin::MeasureSerializer < ActiveModel::Serializer
+  attributes :key, :total, :previous_total, :data
+
+  def total
+    object.total.to_s
+  end
+
+  def previous_total
+    object.previous_total.to_s
+  end
+end
diff --git a/app/serializers/rest/admin/tag_serializer.rb b/app/serializers/rest/admin/tag_serializer.rb
new file mode 100644
index 0000000000..425ba4ba34
--- /dev/null
+++ b/app/serializers/rest/admin/tag_serializer.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class REST::Admin::TagSerializer < REST::TagSerializer
+  attributes :id, :trendable, :usable, :requires_review
+
+  def id
+    object.id.to_s
+  end
+
+  def requires_review
+    object.requires_review?
+  end
+end
diff --git a/app/views/admin/dashboard/index.html.haml b/app/views/admin/dashboard/index.html.haml
index 05b585ab6d..560eba7b4d 100644
--- a/app/views/admin/dashboard/index.html.haml
+++ b/app/views/admin/dashboard/index.html.haml
@@ -1,6 +1,14 @@
+- content_for :header_tags do
+  = javascript_pack_tag 'admin', async: true, crossorigin: 'anonymous'
+
 - content_for :page_title do
   = t('admin.dashboard.title')
 
+- content_for :heading_actions do
+  = l(@time_period.first)
+  = ' - '
+  = l(@time_period.last)
+
 - unless @system_checks.empty?
   .flash-message-stack
     - @system_checks.each do |message|
@@ -9,131 +17,52 @@
         - if message.action
           = link_to t("admin.system_checks.#{message.key}.action"), message.action
 
-.dashboard__counters
-  %div
-    = link_to admin_accounts_url(local: 1, recent: 1) do
-      .dashboard__counters__num{ title: number_with_delimiter(@users_count, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @users_count
-      .dashboard__counters__label= t 'admin.dashboard.total_users'
-  %div
-    %div
-      .dashboard__counters__num{ title: number_with_delimiter(@registrations_week, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @registrations_week
-      .dashboard__counters__label= t 'admin.dashboard.week_users_new'
-  %div
-    %div
-      .dashboard__counters__num{ title: number_with_delimiter(@logins_week, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @logins_week
-      .dashboard__counters__label= t 'admin.dashboard.week_users_active'
-  %div
-    = link_to admin_pending_accounts_path do
-      .dashboard__counters__num{ title: number_with_delimiter(@pending_users_count, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @pending_users_count
-      .dashboard__counters__label= t 'admin.dashboard.pending_users'
-  %div
-    = link_to admin_reports_url do
-      .dashboard__counters__num{ title: number_with_delimiter(@reports_count, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @reports_count
-      .dashboard__counters__label= t 'admin.dashboard.open_reports'
-  %div
-    = link_to admin_tags_path(pending_review: '1') do
-      .dashboard__counters__num{ title: number_with_delimiter(@pending_tags_count, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @pending_tags_count
-      .dashboard__counters__label= t 'admin.dashboard.pending_tags'
-  %div
-    %div
-      .dashboard__counters__num{ title: number_with_delimiter(@interactions_week, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @interactions_week
-      .dashboard__counters__label= t 'admin.dashboard.week_interactions'
-  %div
-    = link_to sidekiq_url do
-      .dashboard__counters__num{ title: number_with_delimiter(@queue_backlog, strip_insignificant_zeros: true) }
-        = friendly_number_to_human @queue_backlog
-      .dashboard__counters__label= t 'admin.dashboard.backlog'
+.dashboard
+  .dashboard__item
+    = react_admin_component :counter, measure: 'new_users', start_at: @time_period.first, end_at: @time_period.last, label: t('admin.dashboard.new_users'), href: admin_accounts_path
 
-.dashboard__widgets
-  .dashboard__widgets__users
-    %div
-      %h4= t 'admin.dashboard.recent_users'
-      %ul
-        - @recent_users.each do |user|
-          %li= admin_account_link_to(user.account)
+  .dashboard__item
+    = react_admin_component :counter, measure: 'active_users', start_at: @time_period.first, end_at: @time_period.last, label: t('admin.dashboard.active_users'), href: admin_accounts_path
 
-  .dashboard__widgets__features
-    %div
-      %h4= t 'admin.dashboard.features'
-      %ul
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_registrations'), edit_admin_settings_path), @registrations_enabled)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_invites'), edit_admin_settings_path), @invites_enabled)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_deletions'), edit_admin_settings_path), @deletions_enabled)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_profile_directory'), edit_admin_settings_path), @profile_directory)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_timeline_preview'), edit_admin_settings_path), @timeline_preview)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.trends'), edit_admin_settings_path), @trends_enabled)
-        %li
-          = feature_hint(link_to(t('admin.dashboard.feature_relay'), admin_relays_path), @relay_enabled)
+  .dashboard__item
+    = react_admin_component :counter, measure: 'interactions', start_at: @time_period.first, end_at: @time_period.last, label: t('admin.dashboard.interactions')
 
-  .dashboard__widgets__versions
-    %div
-      %h4= t 'admin.dashboard.software'
-      %ul
-        %li
-          Mastodon
-          %span.pull-right= @version
-        %li
-          Ruby
-          %span.pull-right= "#{RUBY_VERSION}p#{RUBY_PATCHLEVEL}"
-        %li
-          PostgreSQL
-          %span.pull-right= @database_version
-        %li
-          Redis
-          %span.pull-right= @redis_version
+  .dashboard__item
+    = react_admin_component :counter, measure: 'opened_reports', start_at: @time_period.first, end_at: @time_period.last, label: t('admin.dashboard.opened_reports'), href: admin_reports_path
 
-  .dashboard__widgets__space
-    %div
-      %h4= t 'admin.dashboard.space'
-      %ul
-        %li
-          PostgreSQL
-          %span.pull-right= number_to_human_size @database_size
-        %li
-          Redis
-          %span.pull-right= number_to_human_size @redis_size
+  .dashboard__item
+    = react_admin_component :counter, measure: 'resolved_reports', start_at: @time_period.first, end_at: @time_period.last, label: t('admin.dashboard.resolved_reports'), href: admin_reports_path(resolved: '1')
 
-  .dashboard__widgets__config
-    %div
-      %h4= t 'admin.dashboard.config'
-      %ul
-        %li
-          = feature_hint(t('admin.dashboard.search'), @search_enabled)
-        %li
-          = feature_hint(t('admin.dashboard.single_user_mode'), @single_user_mode)
-        %li
-          = feature_hint(t('admin.dashboard.authorized_fetch_mode'), @authorized_fetch)
-        %li
-          = feature_hint(t('admin.dashboard.whitelist_mode'), @whitelist_enabled)
-        %li
-          = feature_hint('LDAP', @ldap_enabled)
-        %li
-          = feature_hint('CAS', @cas_enabled)
-        %li
-          = feature_hint('SAML', @saml_enabled)
-        %li
-          = feature_hint('PAM', @pam_enabled)
-        %li
-          = feature_hint(t('admin.dashboard.hidden_service'), @hidden_service)
+  .dashboard__item
+    = link_to admin_reports_path, class: 'dashboard__quick-access' do
+      %span= t('admin.dashboard.pending_reports_html', count: @pending_reports_count)
+      = fa_icon 'chevron-right fw'
 
-  .dashboard__widgets__trends
-    %div
-      %h4= t 'admin.dashboard.trends'
-      %ul
-        - @trending_hashtags.each do |tag|
-          %li
-            = link_to content_tag(:span, "##{tag.name}", class: !tag.trendable? && !tag.reviewed? ? 'warning-hint' : (!tag.trendable? ? 'negative-hint' : nil)), admin_tag_path(tag.id)
-            %span.pull-right= number_with_delimiter(tag.history[0][:accounts].to_i)
+    = link_to admin_pending_accounts_path, class: 'dashboard__quick-access' do
+      %span= t('admin.dashboard.pending_users_html', count: @pending_users_count)
+      = fa_icon 'chevron-right fw'
+
+    = link_to admin_tags_path(pending_review: '1'), class: 'dashboard__quick-access' do
+      %span= t('admin.dashboard.pending_tags_html', count: @pending_tags_count)
+      = fa_icon 'chevron-right fw'
+
+  .dashboard__item
+    = react_admin_component :dimension, dimension: 'sources', start_at: @time_period.first, end_at: @time_period.last, limit: 8, label: t('admin.dashboard.sources')
+
+  .dashboard__item
+    = react_admin_component :dimension, dimension: 'languages', start_at: @time_period.first, end_at: @time_period.last, limit: 8, label: t('admin.dashboard.top_languages')
+
+  .dashboard__item
+    = react_admin_component :dimension, dimension: 'servers', start_at: @time_period.first, end_at: @time_period.last, limit: 8, label: t('admin.dashboard.top_servers')
+
+  .dashboard__item.dashboard__item--span-double-column
+    = react_admin_component :retention, start_at: @time_period.last - 6.months,   end_at: @time_period.last, frequency: 'month'
+
+  .dashboard__item.dashboard__item--span-double-row
+    = react_admin_component :trends, limit: 7
+
+  .dashboard__item
+    = react_admin_component :dimension, dimension: 'software_versions', start_at: @time_period.first, end_at: @time_period.last, limit: 4, label: t('admin.dashboard.software')
+
+  .dashboard__item
+    = react_admin_component :dimension, dimension: 'space_usage', start_at: @time_period.first, end_at: @time_period.last, limit: 3, label: t('admin.dashboard.space')
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 486592b29f..5ad5767c9f 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -371,32 +371,28 @@ en:
       updated_msg: Emoji successfully updated!
       upload: Upload
     dashboard:
-      authorized_fetch_mode: Secure mode
-      backlog: backlogged jobs
-      config: Configuration
-      feature_deletions: Account deletions
-      feature_invites: Invite links
-      feature_profile_directory: Profile directory
-      feature_registrations: Registrations
-      feature_relay: Federation relay
-      feature_timeline_preview: Timeline preview
-      features: Features
-      hidden_service: Federation with hidden services
-      open_reports: open reports
-      pending_tags: hashtags waiting for review
-      pending_users: users waiting for review
-      recent_users: Recent users
-      search: Full-text search
-      single_user_mode: Single user mode
+      active_users: active users
+      interactions: interactions
+      media_storage: Media storage
+      new_users: new users
+      opened_reports: reports opened
+      pending_reports_html:
+        one: "<strong>1</strong> pending reports"
+        other: "<strong>%{count}</strong> pending reports"
+      pending_tags_html:
+        one: "<strong>1</strong> pending hashtags"
+        other: "<strong>%{count}</strong> pending hashtags"
+      pending_users_html:
+        one: "<strong>1</strong> pending users"
+        other: "<strong>%{count}</strong> pending users"
+      resolved_reports: reports resolved
       software: Software
+      sources: Sign-up sources
       space: Space usage
       title: Dashboard
-      total_users: users in total
-      trends: Trends
-      week_interactions: interactions this week
-      week_users_active: active this week
-      week_users_new: users this week
-      whitelist_mode: Limited federation mode
+      top_languages: Top active languages
+      top_servers: Top active servers
+      website: Website
     domain_allows:
       add_new: Allow federation with domain
       created_msg: Domain has been successfully allowed for federation
diff --git a/config/routes.rb b/config/routes.rb
index 8abc438fec..6b6a6562d7 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -510,6 +510,12 @@ Rails.application.routes.draw do
             post :resolve
           end
         end
+
+        resources :trends, only: [:index]
+
+        post :measures, to: 'measures#create'
+        post :dimensions, to: 'dimensions#create'
+        post :retention, to: 'retention#create'
       end
     end
 

From 032d9bcaeda5cf2bf39f959bd6ba21bdc1c48f0c Mon Sep 17 00:00:00 2001
From: "dependabot[bot]" <49699333+dependabot[bot]@users.noreply.github.com>
Date: Thu, 14 Oct 2021 20:51:56 +0200
Subject: [PATCH 4/5] Bump puma from 5.5.0 to 5.5.1 (#16851)

Bumps [puma](https://github.com/puma/puma) from 5.5.0 to 5.5.1.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v5.5.0...v5.5.1)

---
updated-dependencies:
- dependency-name: puma
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
---
 Gemfile.lock | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Gemfile.lock b/Gemfile.lock
index d860d1e297..9dcff2c9fd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -424,7 +424,7 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.6)
-    puma (5.5.0)
+    puma (5.5.1)
       nio4r (~> 2.0)
     pundit (2.1.1)
       activesupport (>= 3.0.0)

From 9b978872cc1a86c7d82afda4060c909dc7ca2536 Mon Sep 17 00:00:00 2001
From: Claire <claire.github-309c@sitedethib.com>
Date: Thu, 14 Oct 2021 20:53:11 +0200
Subject: [PATCH 5/5] Fix 404 error when filtering admin action logs by
 non-existent target account (#16643)

Currently, there is no way for an admin to delete an account record. However,
should that happen in the future, or should an admin mistype an account id,
`/admin/action_logs?target_account_id=<non-existent-account-id>` currently
returns a 404 instead of an empty list.

With this commit, the aforementioned page returns a correct list instead
(potentially non-empty if the account has been manually deleted)
---
 app/models/admin/action_log_filter.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/admin/action_log_filter.rb b/app/models/admin/action_log_filter.rb
index a1c156a8bf..6e19dcf708 100644
--- a/app/models/admin/action_log_filter.rb
+++ b/app/models/admin/action_log_filter.rb
@@ -76,7 +76,7 @@ class Admin::ActionLogFilter
     when 'account_id'
       Admin::ActionLog.where(account_id: value)
     when 'target_account_id'
-      account = Account.find(value)
+      account = Account.find_or_initialize_by(id: value)
       Admin::ActionLog.where(target: [account, account.user].compact)
     else
       raise "Unknown filter: #{key}"