public void operationComplete() {
        for (Map.Entry<String, StopWatch> sw : clientStatistics.getStopWatches().entrySet()) {
            sw.getValue().stop();
            metrics.put(sw.getKey(), sw.getValue());
        }
    }
Complete counting metrics on operation and stop all stopwatches.
Multiple calls may have side effects.
Note: should not be called by user code, except when created by user code.
client-v2/src/main/java/com/clickhouse/client/api/metrics/OperationMetrics.java