private HighResolutionClock createHighResClock(Config config) {
    MetricsConfig metricsConfig = new MetricsConfig(config);
    // The timer metrics calculation here is only enabled for debugging
    if (metricsConfig.getMetricsTimerEnabled()
        && metricsConfig.getMetricsTimerDebugEnabled()) {
      return System::nanoTime;
    } else {
      return () -> 0;
    }
  }
Get the unique ID for this {@link OperatorImpl} in the DAG.

Some {@link OperatorImpl}s don't have a 1:1 mapping with their {@link OperatorSpec}. E.g., there are
2 PartialJoinOperatorImpls for a JoinOperatorSpec. Overriding this method allows them to provide an
implementation specific id, e.g., for use in metrics.

@return the unique ID for this {@link OperatorImpl} in the DAG
samza-core/src/main/java/org/apache/samza/operators/impl/OperatorImpl.java