@Override
  public LongCounter counter(String name) {
    final String fullName = getMetricName(name);
    return counterCache.computeIfAbsent(
        fullName,
        fn ->
            new CounterProxy(
                metricService.getOrCreateCounter(getMetricName(name), getMetricLevel(fullName))));
  }
Time taken to process write requests from client.
iotdb-core/consensus/src/main/java/org/apache/iotdb/consensus/ratis/metrics/IoTDBMetricRegistry.java