@Override
    public void shutdown() {
        ThreadUtils.shutdownExecutor(checkerScheduler, 1, TimeUnit.SECONDS);
    }
The current state metrics of the system.
Only used for monitoring.

@see S3StreamKafkaMetricsManager#setBackPressureStateSupplier
core/src/main/java/kafka/automq/backpressure/DefaultBackPressureManager.java