void onJobCallbackProcessingComplete() {
    jobCallbackProcessingCompleteTimeMs = System.currentTimeMillis();
    cryptoJobMetrics.jobCallbackProcessingTimeMs.update(
        jobCallbackProcessingCompleteTimeMs - jobCallbackProcessingStartTimeMs);
  }
Signifies that the job callback processing has completed
ambry-router/src/main/java/com/github/ambry/router/NonBlockingRouterMetrics.java