Anis Elleuch 153d4be032
tracing: NumSubscribers() to use atomic instead of mutex (#11219)
globalSubscribers.NumSubscribers() is heavily used in S3 requests and it
uses mutex, use atomic.Load instead since it is faster

Co-authored-by: Anis Elleuch <anis@min.io>
2021-01-04 09:40:30 -08:00
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