private void addThreadPools(Supplier<ThreadPoolExecutor> batchPool,
    Supplier<ThreadPoolExecutor> metaPool) {
    batchPools.add(batchPool);
    metaPools.add(metaPool);
  }
Add thread pools of additional connections to the metrics
hbase-client/src/main/java/org/apache/hadoop/hbase/client/MetricsConnection.java