chore: port a couple of tests for csm2 (#2816)

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Fixes #<issue_number_goes_here> ☕️

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https://togithub.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md).

Author: igorbernstein2

google-cloud-bigtable/pom.xml

@@ -255,6 +255,11 @@
     </dependency>
 
     <!-- Test dependencies -->
+    <dependency>
+      <groupId>com.google.api.grpc</groupId>
+      <artifactId>grpc-google-cloud-monitoring-v3</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax</artifactId>

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/csm/attributes/MethodInfo.java

@@ -28,6 +28,10 @@ public abstract class MethodInfo {
   /** If the method is streaming (ie a scan). */
   public abstract boolean getStreaming();
 
+  public static MethodInfo of(String name, boolean streaming) {
+    return builder().setName(name).setStreaming(streaming).build();
+  }
+
   public static Builder builder() {
     return new AutoValue_MethodInfo.Builder();
   }

google-cloud-bigtable/src/main/java/com/google/cloud/bigtable/data/v2/internal/csm/metrics/Constants.java

@@ -58,7 +58,8 @@ private MetricLabels() {}
 
     static final AttributeKey<String> CHANNEL_POOL_LB_POLICY = AttributeKey.stringKey("lb_policy");
     static final AttributeKey<String> DP_REASON_KEY = AttributeKey.stringKey("reason");
-    static final AttributeKey<String> DP_IP_PREFERENCE_KEY = AttributeKey.stringKey("reason");
+    static final AttributeKey<String> DP_IP_PREFERENCE_KEY =
+        AttributeKey.stringKey("ip_preference");
 
     public static final AttributeKey<String> STATUS_KEY = AttributeKey.stringKey("status");