Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/controllers/about_controller.rb
- app/controllers/tags_controller.rb
- app/views/about/show.html.haml
- spec/views/about/show.html.haml_spec.rb

app/presenters/instance_presenter.rb

@@ -21,6 +21,10 @@ class InstancePresenter
     Rails.cache.fetch('user_count') { User.confirmed.joins(:account).merge(Account.without_suspended).count }
   end
 
+  def active_user_count
+    Rails.cache.fetch('active_user_count') { Redis.current.pfcount(*(0..3).map { |i| "activity:logins:#{i.weeks.ago.utc.to_date.cweek}" }) }
+  end
+
   def status_count
     Rails.cache.fetch('local_status_count') { Account.local.joins(:account_stat).sum('account_stats.statuses_count') }.to_i
   end
@@ -29,6 +33,10 @@ class InstancePresenter
     Rails.cache.fetch('distinct_domain_count') { Account.distinct.count(:domain) }
   end
 
+  def sample_accounts
+    Rails.cache.fetch('sample_accounts', expires_in: 12.hours) { Account.discoverable.popular.limit(3) }
+  end
+
   def version_number
     Mastodon::Version
   end