9 files changed, 144 insertions, 6 deletions
diff --git a/app/controllers/admin/dashboard_controller.rb b/app/controllers/admin/dashboard_controller.rb
index e87dd076f..9e921fb95 100644
--- a/app/controllers/admin/dashboard_controller.rb
+++ b/app/controllers/admin/dashboard_controller.rb
@@ -3,13 +3,8 @@ require 'sidekiq/api'
 
 module Admin
   class DashboardController < BaseController
-    SIDEKIQ_QUEUES = %w(default push mailers pull scheduler).freeze
-
     def index
-      missing_queues = Sidekiq::ProcessSet.new.reduce(SIDEKIQ_QUEUES) { |queues, process| queues - process['queues'] }
-
-      flash.now[:alert] = I18n.t('admin.dashboard.misconfigured_sidekiq_alert', queues: missing_queues.join(', ')) unless missing_queues.empty?
-
+      @system_checks         = Admin::SystemCheck.perform
       @users_count           = User.count
       @pending_users_count   = User.pending.count
       @registrations_week    = Redis.current.get("activity:accounts:local:#{current_week}") || 0
diff --git a/app/javascript/styles/mastodon/forms.scss b/app/javascript/styles/mastodon/forms.scss
index 5ace0d97c..021db048b 100644
--- a/app/javascript/styles/mastodon/forms.scss
+++ b/app/javascript/styles/mastodon/forms.scss
@@ -598,6 +598,12 @@ code {
     color: $valid-value-color;
   }
 
+  &.warning {
+    border: 1px solid rgba($gold-star, 0.5);
+    background: rgba($gold-star, 0.25);
+    color: $gold-star;
+  }
+
   &.alert {
     border: 1px solid rgba($error-value-color, 0.5);
     background: rgba($error-value-color, 0.1);
@@ -619,6 +625,19 @@ code {
     }
   }
 
+  &.warning a {
+    font-weight: 700;
+    color: inherit;
+    text-decoration: underline;
+
+    &:hover,
+    &:focus,
+    &:active {
+      text-decoration: none;
+      color: inherit;
+    }
+  }
+
   p {
     margin-bottom: 15px;
   }
@@ -675,6 +694,29 @@ code {
   }
 }
 
+.flash-message-stack {
+  margin-bottom: 30px;
+
+  .flash-message {
+    border-radius: 0;
+    margin-bottom: 0;
+    border-top-width: 0;
+
+    &:first-child {
+      border-radius: 4px 4px 0 0;
+      border-top-width: 1px;
+    }
+
+    &:last-child {
+      border-radius: 0 0 4px 4px;
+
+      &:first-child {
+        border-radius: 4px;
+      }
+    }
+  }
+}
+
 .form-footer {
   margin-top: 30px;
   text-align: center;
diff --git a/app/lib/admin/system_check.rb b/app/lib/admin/system_check.rb
new file mode 100644
index 000000000..afb20cb47
--- /dev/null
+++ b/app/lib/admin/system_check.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class Admin::SystemCheck
+  ACTIVE_CHECKS = [
+    Admin::SystemCheck::DatabaseSchemaCheck,
+    Admin::SystemCheck::SidekiqProcessCheck,
+    Admin::SystemCheck::RulesCheck,
+  ].freeze
+
+  def self.perform
+    ACTIVE_CHECKS.each_with_object([]) do |klass, arr|
+      check = klass.new
+
+      if check.pass?
+        arr
+      else
+        arr << check.message
+      end
+    end
+  end
+end
diff --git a/app/lib/admin/system_check/base_check.rb b/app/lib/admin/system_check/base_check.rb
new file mode 100644
index 000000000..fcad8daca
--- /dev/null
+++ b/app/lib/admin/system_check/base_check.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Admin::SystemCheck::BaseCheck
+  def pass?
+    raise NotImplementedError
+  end
+
+  def message
+    raise NotImplementedError
+  end
+end
diff --git a/app/lib/admin/system_check/database_schema_check.rb b/app/lib/admin/system_check/database_schema_check.rb
new file mode 100644
index 000000000..b93d1954e
--- /dev/null
+++ b/app/lib/admin/system_check/database_schema_check.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Admin::SystemCheck::DatabaseSchemaCheck < Admin::SystemCheck::BaseCheck
+  def pass?
+    !ActiveRecord::Base.connection.migration_context.needs_migration?
+  end
+
+  def message
+    Admin::SystemCheck::Message.new(:database_schema_check)
+  end
+end
diff --git a/app/lib/admin/system_check/message.rb b/app/lib/admin/system_check/message.rb
new file mode 100644
index 000000000..bfcad3bf3
--- /dev/null
+++ b/app/lib/admin/system_check/message.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Admin::SystemCheck::Message
+  attr_reader :key, :value, :action
+
+  def initialize(key, value = nil, action = nil)
+    @key    = key
+    @value  = value
+    @action = action
+  end
+end
diff --git a/app/lib/admin/system_check/rules_check.rb b/app/lib/admin/system_check/rules_check.rb
new file mode 100644
index 000000000..1fbdf955d
--- /dev/null
+++ b/app/lib/admin/system_check/rules_check.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class Admin::SystemCheck::RulesCheck < Admin::SystemCheck::BaseCheck
+  include RoutingHelper
+
+  def pass?
+    Rule.kept.exists?
+  end
+
+  def message
+    Admin::SystemCheck::Message.new(:rules_check, nil, admin_rules_path)
+  end
+end
diff --git a/app/lib/admin/system_check/sidekiq_process_check.rb b/app/lib/admin/system_check/sidekiq_process_check.rb
new file mode 100644
index 000000000..c44d86c44
--- /dev/null
+++ b/app/lib/admin/system_check/sidekiq_process_check.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class Admin::SystemCheck::SidekiqProcessCheck < Admin::SystemCheck::BaseCheck
+  SIDEKIQ_QUEUES = %w(
+    default
+    push
+    mailers
+    pull
+    scheduler
+    ingress
+  ).freeze
+
+  def pass?
+    missing_queues.empty?
+  end
+
+  def message
+    Admin::SystemCheck::Message.new(:sidekiq_process_check, missing_queues.join(', '))
+  end
+
+  private
+
+  def missing_queues
+    @missing_queues ||= Sidekiq::ProcessSet.new.reduce(SIDEKIQ_QUEUES) { |queues, process| queues - process['queues'] }
+  end
+end
diff --git a/app/views/admin/dashboard/index.html.haml b/app/views/admin/dashboard/index.html.haml
index 249e12563..f2f0c813d 100644
--- a/app/views/admin/dashboard/index.html.haml
+++ b/app/views/admin/dashboard/index.html.haml
@@ -1,6 +1,14 @@
 - content_for :page_title do
   = t('admin.dashboard.title')
 
+- unless @system_checks.empty?
+  .flash-message-stack
+    - @system_checks.each do |message|
+      .flash-message.warning
+        = t("admin.system_checks.#{message.key}.message_html", message.value ? { value: content_tag(:strong, message.value) } : {})
+        - 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