add script for checking gprc metrics - working locally

.github/scripts/metrics.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+# Declare expected values for each metric as environment variables
+EXPECTED_CREATE_BUCKET=0
+EXPECTED_DELETE_BUCKET=0
+EXPECTED_GET_INFO=3
+EXPECTED_GRANT_ACCESS=0
+EXPECTED_REVOKE_ACCESS=0
+GRPC_METHOD_TO_TEST="grpc_server_msg_sent_total"
+
+# Fetch metrics and filter for grpc_server_msg_sent_total
+METRICS=$(curl -s localhost:8080/metrics | grep $GRPC_METHOD_TO_TEST)
+echo "Validating gRPC Server Metrics..."
+
+# Loop through each line
+echo "$METRICS" | while read -r line; do
+  # Extract the grpc_method and value
+  method=$(echo "$line" | sed -n 's/.*grpc_method="\([^"]*\)".*/\1/p') # Extract method name
+  value=$(echo "$line" | awk '{print $NF}')                           # Extract value
+
+  # Determine the expected value based on the grpc_method
+  case "$method" in
+    "DriverCreateBucket")
+      expected_value=$EXPECTED_CREATE_BUCKET
+      ;;
+    "DriverDeleteBucket")
+      expected_value=$EXPECTED_DELETE_BUCKET
+      ;;
+    "DriverGetInfo")
+      expected_value=$EXPECTED_GET_INFO
+      ;;
+    "DriverGrantBucketAccess")
+      expected_value=$EXPECTED_GRANT_ACCESS
+      ;;
+    "DriverRevokeBucketAccess")
+      expected_value=$EXPECTED_REVOKE_ACCESS
+      ;;
+    *)
+      echo "Unknown method: $method. Skipping validation."
+      continue
+      ;;
+  esac
+
+  # Display method, value, and expected value
+  echo "Method: $method, Value: $value, Expected: $expected_value"
+
+  # Perform validation
+  if [[ "$value" -ne "$expected_value" ]]; then
+    echo "Error: $method has an unexpected value ($value). Expected: $expected_value"
+    exit 1
+  fi
+done
+
+echo "All metrics validated successfully."