fix: Fix export to log detect resource errors (#2197)

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Fixes #<issue_number_goes_here> ☕️

If you write sample code, please follow the [samples format](
https://togithub.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md).

Author: mutianf

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/EnhancedBigtableStub.java

@@ -149,6 +149,8 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
@@ -166,6 +168,9 @@
  */
 @InternalApi
 public class EnhancedBigtableStub implements AutoCloseable {
+
+  private static final Logger logger = Logger.getLogger(EnhancedBigtableStub.class.getName());
+
   private static final String CLIENT_NAME = "Bigtable";
   private static final long FLOW_CONTROL_ADJUSTING_INTERVAL_MS = TimeUnit.SECONDS.toMillis(20);
   private final EnhancedBigtableStubSettings settings;
@@ -238,8 +243,15 @@ public static ClientContext createClientContext(EnhancedBigtableStubSettings set
             ? ((InstantiatingGrpcChannelProvider) builder.getTransportChannelProvider()).toBuilder()
             : null;
 
-    OpenTelemetry openTelemetry =
-        getOpenTelemetry(settings.getProjectId(), settings.getMetricsProvider(), credentials);
+    OpenTelemetry openTelemetry = null;
+    try {
+      // We don't want client side metrics to crash the client, so catch any exception when getting
+      // the OTEL instance and log the exception instead.
+      openTelemetry =
+          getOpenTelemetry(settings.getProjectId(), settings.getMetricsProvider(), credentials);
+    } catch (Throwable t) {
+      logger.log(Level.WARNING, "Failed to get OTEL, will skip exporting client side metrics", t);
+    }
     ErrorCountPerConnectionMetricTracker errorCountPerConnectionMetricTracker;
     // Skip setting up ErrorCountPerConnectionMetricTracker if openTelemetry is null
     if (openTelemetry != null && transportProvider != null) {
@@ -291,7 +303,8 @@ public static ClientContext createClientContext(EnhancedBigtableStubSettings set
   }
 
   public static ApiTracerFactory createBigtableTracerFactory(
-      EnhancedBigtableStubSettings settings, OpenTelemetry openTelemetry) throws IOException {
+      EnhancedBigtableStubSettings settings, @Nullable OpenTelemetry openTelemetry)
+      throws IOException {
     return createBigtableTracerFactory(
         settings, Tags.getTagger(), Stats.getStatsRecorder(), openTelemetry);
   }
@@ -301,7 +314,7 @@ public static ApiTracerFactory createBigtableTracerFactory(
       EnhancedBigtableStubSettings settings,
       Tagger tagger,
       StatsRecorder stats,
-      OpenTelemetry openTelemetry)
+      @Nullable OpenTelemetry openTelemetry)
       throws IOException {
     String projectId = settings.getProjectId();
     String instanceId = settings.getInstanceId();

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/stub/metrics/BigtableExporterUtils.java

@@ -151,25 +151,36 @@ static List<TimeSeries> convertToApplicationResourceTimeSeries(
   static MonitoredResource detectResource() {
     GCPPlatformDetector detector = GCPPlatformDetector.DEFAULT_INSTANCE;
     DetectedPlatform detectedPlatform = detector.detectPlatform();
-    switch (detectedPlatform.getSupportedPlatform()) {
-      case GOOGLE_COMPUTE_ENGINE:
-        return createGceMonitoredResource(
-            detectedPlatform.getProjectId(), detectedPlatform.getAttributes());
-      case GOOGLE_KUBERNETES_ENGINE:
-        return createGkeMonitoredResource(
-            detectedPlatform.getProjectId(), detectedPlatform.getAttributes());
-      default:
-        return null;
+    MonitoredResource monitoredResource = null;
+    try {
+      switch (detectedPlatform.getSupportedPlatform()) {
+        case GOOGLE_COMPUTE_ENGINE:
+          monitoredResource =
+              createGceMonitoredResource(
+                  detectedPlatform.getProjectId(), detectedPlatform.getAttributes());
+          break;
+        case GOOGLE_KUBERNETES_ENGINE:
+          monitoredResource =
+              createGkeMonitoredResource(
+                  detectedPlatform.getProjectId(), detectedPlatform.getAttributes());
+          break;
+      }
+    } catch (IllegalStateException e) {
+      logger.log(
+          Level.WARNING,
+          "Failed to create monitored resource for " + detectedPlatform.getSupportedPlatform(),
+          e);
     }
+    return monitoredResource;
   }
 
   private static MonitoredResource createGceMonitoredResource(
       String projectId, Map<String, String> attributes) {
     return MonitoredResource.newBuilder()
         .setType("gce_instance")
         .putLabels("project_id", projectId)
-        .putLabels("instance_id", attributes.get(AttributeKeys.GCE_INSTANCE_ID))
-        .putLabels("zone", attributes.get(AttributeKeys.GCE_AVAILABILITY_ZONE))
+        .putLabels("instance_id", getAttribute(attributes, AttributeKeys.GCE_INSTANCE_ID))
+        .putLabels("zone", getAttribute(attributes, AttributeKeys.GCE_AVAILABILITY_ZONE))
         .build();
   }
 
@@ -178,14 +189,23 @@ private static MonitoredResource createGkeMonitoredResource(
     return MonitoredResource.newBuilder()
         .setType("k8s_container")
         .putLabels("project_id", projectId)
-        .putLabels("location", attributes.get(AttributeKeys.GKE_CLUSTER_LOCATION))
-        .putLabels("cluster_name", attributes.get(AttributeKeys.GKE_CLUSTER_NAME))
+        .putLabels("location", getAttribute(attributes, AttributeKeys.GKE_CLUSTER_LOCATION))
+        .putLabels("cluster_name", getAttribute(attributes, AttributeKeys.GKE_CLUSTER_NAME))
         .putLabels("namespace_name", MoreObjects.firstNonNull(System.getenv("NAMESPACE"), ""))
         .putLabels("pod_name", MoreObjects.firstNonNull(System.getenv("HOSTNAME"), ""))
         .putLabels("container_name", MoreObjects.firstNonNull(System.getenv("CONTAINER_NAME"), ""))
         .build();
   }
 
+  private static String getAttribute(Map<String, String> attributes, String key) {
+    String value = attributes.get(key);
+    if (value == null) {
+      throw new IllegalStateException(
+          "Required attribute " + key + " does not exist in the attributes map " + attributes);
+    }
+    return value;
+  }
+
   private static TimeSeries convertPointToBigtableTimeSeries(
       MetricData metricData, PointData pointData, String taskId) {
     TimeSeries.Builder builder =