1 files changed, 52 insertions, 0 deletions
diff --git a/lib/gitlab/metrics/rails_slis.rb b/lib/gitlab/metrics/rails_slis.rb
new file mode 100644
index 00000000000..69e0c1e9fde
--- /dev/null
+++ b/lib/gitlab/metrics/rails_slis.rb
@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Metrics
+    module RailsSlis
+      class << self
+        def request_apdex_counters_enabled?
+          Feature.enabled?(:request_apdex_counters)
+        end
+
+        def initialize_request_slis_if_needed!
+          return unless request_apdex_counters_enabled?
+          return if Gitlab::Metrics::Sli.initialized?(:rails_request_apdex)
+
+          Gitlab::Metrics::Sli.initialize_sli(:rails_request_apdex, possible_request_labels)
+        end
+
+        def request_apdex
+          Gitlab::Metrics::Sli[:rails_request_apdex]
+        end
+
+        private
+
+        def possible_request_labels
+          possible_controller_labels + possible_api_labels
+        end
+
+        def possible_api_labels
+          Gitlab::RequestEndpoints.all_api_endpoints.map do |route|
+            endpoint_id = API::Base.endpoint_id_for_route(route)
+            route_class = route.app.options[:for]
+            feature_category = route_class.feature_category_for_app(route.app)
+
+            {
+              endpoint_id: endpoint_id,
+              feature_category: feature_category
+            }
+          end
+        end
+
+        def possible_controller_labels
+          Gitlab::RequestEndpoints.all_controller_actions.map do |controller, action|
+            {
+              endpoint_id: controller.endpoint_id_for_action(action),
+              feature_category: controller.feature_category_for_action(action)
+            }
+          end
+        end
+      end
+    end
+  end
+end