code: public static GobblinMetrics get(String id, MetricContext parentContext) {
      return get(id, parentContext, Lists.<Tag<?>>newArrayList());
    }
docs: Get a {@link GobblinMetrics} instance with the given ID and parent {@link MetricContext}.
  
  @param id the given {@link GobblinMetrics} ID
  @param parentContext the given parent {@link MetricContext}
  @return a {@link GobblinMetrics} instance