Add HystrixThreadPool to the stream

[bhugot]

Hi,
There is a missing part of stream for HystrixThreadPool.

Would be nice to have it

[markvincze]

Hi @bhugot,

You mean that HystrixThreadPoolMetrics doesn't have a real implementation, it's just returning dummy values, right?

@JorritSalverda do you remember what is the status of that? I remember we had some technical limitations preventing us from properly implementing this at the time. Or is it just that we haven't got around to do it yet?

[JorritSalverda]

@markvincze @bhugot The tracking of thread pool metrics in the original Hystrix library makes sense because you can create multiple thread pools in Java. However when I ported the library to .net I found out there's no such thing in asp.net. I did collect some metrics briefly to see if was of any use in the Hystrix dashboard, but it turned out to be really useless, so we might as well remove it altogether.

To get a better understanding of your thread pool metrics I would look at using Prometheus and the WMI exporter to collect those.