fix directpath test

Author: surbhigarg92

google-cloud-spanner/src/test/java/com/google/cloud/spanner/it/ITBuiltInMetricsTest.java

@@ -51,14 +51,13 @@ public class ITBuiltInMetricsTest {
 
   private static MetricServiceClient metricClient;
 
-  private static final String[] METRICS = {
-    "operation_latencies",
-    "attempt_latencies",
-    "operation_count",
-    "attempt_count",
-    "gfe_latencies",
-    "afe_latencies"
-  };
+  private static java.util.List<String> METRICS = new java.util.ArrayList<String>() {{
+    add("operation_latencies");
+    add("attempt_latencies");
+    add("operation_count");
+    add("attempt_count");
+    add("afe_latencies");
+  }};
 
   @BeforeClass
   public static void setUp() throws IOException {
@@ -67,6 +66,9 @@ public static void setUp() throws IOException {
     // Enable BuiltinMetrics when the metrics are GA'ed
     db = env.getTestHelper().createTestDatabase();
     client = env.getTestHelper().getDatabaseClient(db);
+    if(!env.getTestHelper().getOptions().isEnableDirectAccess()) {
+      METRICS.add("gfe_latencies");
+    }
   }
 
   @After