Is there a way to find out how many threads are active in the thread pool?

[Phoebus888]

My code is as follows

    @Override
    public void bindTo(MeterRegistry registry) {
        EventLoopGroupProvider provider = clientResources.eventLoopGroupProvider();
        //Total thread pool
        registry.gauge("lettuce.pool.size", provider, EventLoopGroupProvider::threadPoolSize);
        //Active thread pool
       How does the code implement
    }

Now I want to add a method to get the size of the running thread pool to the metrics for monitoring, how to implement

[mp911de]

You can implement EventLoopGroupProvider to decorate DefaultEventLoopGroupProvider.
However, the concept of EventLoopGroup is to configure it with a fixed number of threads and the executor service will spin up that many threads so your gauge could be also configured with the values of computationThreadPoolSize and ioThreadPoolSize provided to ClientResources.Builder.