Additional metrics initial work, with working metrics listing, but without actoual metrics mesurements

2 files changed, 28 insertions, 0 deletions

diff --git a/app/controllers/projects/environments_controller.rb b/app/controllers/projects/environments_controller.rb
index efe83776834..6d230e84ef7 100644
--- a/app/controllers/projects/environments_controller.rb
+++ b/app/controllers/projects/environments_controller.rb
@@ -129,6 +129,12 @@ class Projects::EnvironmentsController < Projects::ApplicationController
     end
   end
 
+  def additional_metrics
+    additional_metrics = environment.additional_metrics || {}
+
+    render json: additional_metrics, status: additional_metrics.any? ? :ok : :no_content
+  end
+
   private
 
   def verify_api_request!
diff --git a/app/controllers/projects/prometheus_controller.rb b/app/controllers/projects/prometheus_controller.rb
new file mode 100644
index 00000000000..74e247535d5
--- /dev/null
+++ b/app/controllers/projects/prometheus_controller.rb
@@ -0,0 +1,22 @@
+class Projects::PrometheusController < Projects::ApplicationController
+  before_action :authorize_read_project!
+
+  def active_metrics
+    return render_404 unless has_prometheus_metrics?
+    matched_metrics = prometheus_service.reactive_query(Gitlab::Prometheus::Queries::MatchedMetricsQuery.name, &:itself)
+
+    if matched_metrics
+      render json: matched_metrics, status: :ok
+    else
+      head :no_content
+    end
+  end
+
+  def prometheus_service
+    project.monitoring_service
+  end
+
+  def has_prometheus_metrics?
+    prometheus_service&.respond_to?(:reactive_query)
+  end
+end