1 files changed, 42 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/dashboard/stages/endpoint_inserter.rb b/lib/gitlab/metrics/dashboard/stages/endpoint_inserter.rb
new file mode 100644
index 00000000000..2a959854be0
--- /dev/null
+++ b/lib/gitlab/metrics/dashboard/stages/endpoint_inserter.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Metrics
+    module Dashboard
+      module Stages
+        class EndpointInserter < BaseStage
+          MissingQueryError = Class.new(DashboardProcessingError)
+
+          def transform!
+            for_metrics do |metric|
+              metric[:prometheus_endpoint_path] = endpoint_for_metric(metric)
+            end
+          end
+
+          private
+
+          def endpoint_for_metric(metric)
+            Gitlab::Routing.url_helpers.prometheus_api_project_environment_path(
+              project,
+              environment,
+              proxy_path: query_type(metric),
+              query: query_for_metric(metric)
+            )
+          end
+
+          def query_type(metric)
+            metric[:query] ? :query : :query_range
+          end
+
+          def query_for_metric(metric)
+            query = metric[query_type(metric)]
+
+            raise MissingQueryError.new('Each "metric" must define one of :query or :query_range') unless query
+
+            query
+          end
+        end
+      end
+    end
+  end
+end