Update metric names to match Prometheus guidelines.pawel/backport-metrics-renames-to-9-4

Related to #35031

See merge request !12812

1 files changed, 40 insertions, 0 deletions

diff --git a/lib/gitlab/metrics/requests_rack_middleware.rb b/lib/gitlab/metrics/requests_rack_middleware.rb
new file mode 100644
index 00000000000..0dc19f31d03
--- /dev/null
+++ b/lib/gitlab/metrics/requests_rack_middleware.rb
@@ -0,0 +1,40 @@
+module Gitlab
+  module Metrics
+    class RequestsRackMiddleware
+      def initialize(app)
+        @app = app
+      end
+
+      def self.http_request_total
+        @http_request_total ||= Gitlab::Metrics.counter(:http_requests_total, 'Request count')
+      end
+
+      def self.rack_uncaught_errors_count
+        @rack_uncaught_errors_count ||= Gitlab::Metrics.counter(:rack_uncaught_errors_total, 'Request handling uncaught errors count')
+      end
+
+      def self.http_request_duration_seconds
+        @http_request_duration_seconds ||= Gitlab::Metrics.histogram(:http_request_duration_seconds, 'Request handling execution time',
+                                                           {}, [0.05, 0.1, 0.25, 0.5, 0.7, 1, 2.5, 5, 10, 25])
+      end
+
+      def call(env)
+        method = env['REQUEST_METHOD'].downcase
+        started = Time.now.to_f
+        begin
+          RequestsRackMiddleware.http_request_total.increment(method: method)
+
+          status, headers, body = @app.call(env)
+
+          elapsed = Time.now.to_f - started
+          RequestsRackMiddleware.http_request_duration_seconds.observe({ method: method, status: status }, elapsed)
+
+          [status, headers, body]
+        rescue
+          RequestsRackMiddleware.rack_uncaught_errors_count.increment
+          raise
+        end
+      end
+    end
+  end
+end