docs: public void addMetricException(TopologyMaster.PublishMetrics metrics) {
      synchronized (CacheCore.class) {
        for (TopologyMaster.MetricDatum metricDatum : metrics.getMetricsList()) {
          addMetric(metricDatum);
        }
        for (TopologyMaster.TmasterExceptionLog exceptionLog : metrics.getExceptionsList()) {
          addException(exceptionLog);
        }
      }
    }