rmatharu commented on a change in pull request #1566:
URL: https://github.com/apache/samza/pull/1566#discussion_r763249189



##########
File path: 
samza-core/src/main/java/org/apache/samza/metrics/reporter/MetricsHeader.java
##########
@@ -39,6 +41,10 @@
   private final String jobId;
   private final String containerName;
   private final String execEnvironmentContainerId;
+  /**
+   * This is optional for backwards compatibility. It was added added after 
the initial version of this class.
+   */
+  private final Optional<String> execEnvironmentAttemptId;

Review comment:
       nit: should we call it
   exec-env-job-attempt-id
   or
   job-attempt-id




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