1 files changed, 72 insertions, 0 deletions
diff --git a/app/services/metrics/dashboard/gitlab_alert_embed_service.rb b/app/services/metrics/dashboard/gitlab_alert_embed_service.rb
new file mode 100644
index 00000000000..5515b84f112
--- /dev/null
+++ b/app/services/metrics/dashboard/gitlab_alert_embed_service.rb
@@ -0,0 +1,72 @@
+# frozen_string_literal: true
+
+# Responsible for returning an embed containing the specified
+# metrics chart for an alert. Creates panels based on the
+# matching metric stored in the database.
+#
+# Use Gitlab::Metrics::Dashboard::Finder to retrieve dashboards.
+module Metrics
+  module Dashboard
+    class GitlabAlertEmbedService < ::Metrics::Dashboard::BaseEmbedService
+      include Gitlab::Utils::StrongMemoize
+
+      SEQUENCE = [STAGES::EndpointInserter].freeze
+
+      class << self
+        # Determines whether the provided params are sufficient
+        # to uniquely identify a panel composed of user-defined
+        # custom metrics from the DB.
+        def valid_params?(params)
+          [
+            embedded?(params[:embedded]),
+            params[:prometheus_alert_id].is_a?(Integer)
+          ].all?
+        end
+      end
+
+      def raw_dashboard
+        panels_not_found!(alert_id: alert_id) unless alert && prometheus_metric
+
+        { 'panel_groups' => [{ 'panels' => [panel] }] }
+      end
+
+      private
+
+      def allowed?
+        Ability.allowed?(current_user, :read_prometheus_alerts, project)
+      end
+
+      def alert_id
+        params[:prometheus_alert_id]
+      end
+
+      def alert
+        strong_memoize(:alert) do
+          Projects::Prometheus::AlertsFinder.new(id: alert_id).execute.first
+        end
+      end
+
+      def process_params
+        params.merge(environment: alert.environment)
+      end
+
+      def prometheus_metric
+        strong_memoize(:prometheus_metric) do
+          PrometheusMetricsFinder.new(id: alert.prometheus_metric_id).execute.first
+        end
+      end
+
+      def panel
+        {
+          title: prometheus_metric.title,
+          y_label: prometheus_metric.y_label,
+          metrics: [prometheus_metric.to_metric_hash]
+        }
+      end
+
+      def sequence
+        SEQUENCE
+      end
+    end
+  end
+end