chore: Remove dependency from exporter-metrics

Author: lqiu96

java-datastore/google-cloud-datastore/src/main/java/com/google/cloud/datastore/telemetry/TelemetryUtils.java

@@ -73,7 +73,9 @@ public static void recordOperationMetrics(
       Stopwatch operationStopwatch,
       String methodName,
       String status) {
-    if (methodName != null) {
+    if (methodName != null
+        && !TelemetryConstants.Transport.GRPC.getTransport()
+            .equals(TelemetryConstants.getTransportName(datastoreOptions.getTransportOptions()))) {
       Map<String, String> attributes = buildMetricAttributes(datastoreOptions, methodName, status);
       metricsRecorder.recordOperationLatency(
           operationStopwatch.elapsed(TimeUnit.MILLISECONDS), attributes);
@@ -108,10 +110,14 @@ public static <T> Callable<T> attemptMetricsCallable(
         status = DatastoreException.extractStatusCode(e);
         throw e;
       } finally {
-        Map<String, String> attributes =
-            buildMetricAttributes(datastoreOptions, methodName, status);
-        metricsRecorder.recordAttemptLatency(stopwatch.elapsed(TimeUnit.MILLISECONDS), attributes);
-        metricsRecorder.recordAttemptCount(1, attributes);
+        if (!TelemetryConstants.Transport.GRPC.getTransport()
+            .equals(TelemetryConstants.getTransportName(datastoreOptions.getTransportOptions()))) {
+          Map<String, String> attributes =
+              buildMetricAttributes(datastoreOptions, methodName, status);
+          metricsRecorder.recordAttemptLatency(
+              stopwatch.elapsed(TimeUnit.MILLISECONDS), attributes);
+          metricsRecorder.recordAttemptCount(1, attributes);
+        }
       }
     };
   }