From 2c64bc93ee09bf0fabfaa4bb6011811a2d3e138a Mon Sep 17 00:00:00 2001
From: NipunaMadhushan <nipuna.madhushan96@gmail.com>
Date: Fri, 28 Jun 2024 11:50:52 +0530
Subject: [PATCH] Include response error count metric

---
 .../observability/metrics/BallerinaMetricsObserver.java       | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/observability/metrics/BallerinaMetricsObserver.java b/bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/observability/metrics/BallerinaMetricsObserver.java
index 8b13a742095e..d796ed991094 100644
--- a/bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/observability/metrics/BallerinaMetricsObserver.java
+++ b/bvm/ballerina-runtime/src/main/java/io/ballerina/runtime/observability/metrics/BallerinaMetricsObserver.java
@@ -127,6 +127,10 @@ private void stopObservation(ObserverContext observerContext) {
                     "Total response response time for all requests", tags)).increment(duration);
             metricRegistry.counter(new MetricId("requests_total",
                     "Total number of requests", tags)).increment();
+            if (statusCode != null && 400 <= statusCode && statusCode < 600) {
+                metricRegistry.counter(new MetricId("response_errors_total",
+                        "Total number of response errors", tags)).increment();
+            }
         } catch (RuntimeException e) {
             handleError("multiple metrics", tags, e);
         }