[monitoring] refactor monitoring #763
Merged
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Lately there was a case when internal monitoring wasn't running. So I changed life of internals for the whole time of application, so we don't have to synchronize
StartandStopandSendand just consume. Thanks to this I could drop atomic load in Sending.I also added
WaitUntilRunningmostly for informative purposes it is not 100% necessary for correct function of the library, but it is really helpful for testing.