queue stats logging refinements #1876
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* New tunable, queue_manager_log_frequency, setting the interval,
in seconds, between logging of queue stats in replrtq_{snk,src}.
* New tunable, queue_manager_log_suppress_zero_stats, optionally to
avoid logging of zero stats in replrtq_src and overflow_queue.
* Logging in replrtq_* is now done with queue_name in lager:info metadata,
to allow operators to filter such entries into separate lager sinks.
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This is #1875 manually reapplied to 3.0 branch. Specifically:
New tunable,
queue_manager_log_frequency, setting the interval, in seconds, between logging of queue stats in replrtq_{snk,src}.New tunable,
queue_manager_log_suppress_zero_stats, optionally to avoid logging of zero stats in replrtq_src and overflow_queue.Logging in replrtq_* is now done with
queue_namein lager:info metadata, to allow operators to filter such entries into separate lager sinks.