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    • Richard van der Hoff's avatar
      Improve `reactor_tick_time` metric (#11724) · 6a78ede5
      Richard van der Hoff authored
      The existing implementation of the `python_twisted_reactor_tick_time` metric is pretty useless, because it *only* 
      measures the time taken to execute timed calls and callbacks from threads. That neglects everything that 
      happens off the back of I/O, which is obviously quite a lot for us.
      
      To improve this, I've hooked into a different place in the reactor - in particular, where it calls `epoll`. That call is 
      the only place it should wait for something to happen - the rest of the loop *should* be quick.
      
      I've also removed `python_twisted_reactor_pending_calls`, because I don't believe anyone ever looks at it, and
      it's a nuisance to populate.
      6a78ede5
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