public void incrCacheDroppingExceptions(Object exception) {
    getMetric(
      CACHE_BASE + (exception == null ? UNKNOWN_EXCEPTION : exception.getClass().getSimpleName()),
      cacheDroppingExceptions, counterFactory).inc();
  }
Report table rpc context to metrics system.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/MetricsConnection.java