From 930eba914a9f380c9dd943d3a8aa33a3230ed650 Mon Sep 17 00:00:00 2001
From: Vamshi Maskuri <117595548+varshith257@users.noreply.github.com>
Date: Wed, 30 Oct 2024 22:26:49 +0530
Subject: [PATCH] Update Metric.scala

---
 .../sttp/tapir/server/metrics/Metric.scala    | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/server/core/src/main/scala/sttp/tapir/server/metrics/Metric.scala b/server/core/src/main/scala/sttp/tapir/server/metrics/Metric.scala
index 8c90e9fb3b..05bb9762ed 100644
--- a/server/core/src/main/scala/sttp/tapir/server/metrics/Metric.scala
+++ b/server/core/src/main/scala/sttp/tapir/server/metrics/Metric.scala
@@ -64,3 +64,22 @@ object MetricLabels {
     )
   )
 }
+
+object OTELMetricLabels {
+
+  /** Labels request by path and http.request.method, response by http.response.status_code */
+  lazy val Default: MetricLabels = MetricLabels(
+    forRequest = List(
+      "http.request.method" -> { case (_, req) => req.method.method },
+      "path" -> { case (ep, _) => ep.showPathTemplate(showQueryParam = None) }
+    ),
+    forResponse = List(
+      "http.response.status_code" -> {
+        // OpenTelemetry-compliant
+        case Right(r) => r.code.code.toString
+        // Default to 500 for exceptions
+        case Left(_) => "500"
+      }
+    )
+  )
+}