buffer: Use metrics plugin mechanism on a plugin base class #3484
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Which issue(s) this PR fixes:
None
What this PR does / why we need it:
We should add more metrics plugin supported plugin base classes.
With these changes, our cmetrics metrics plugin also can work with Fluentd and Fluentd can handle native metrics to send prometheus format encodable metrics via fluent-plugin-metrics-cmetrics which binds cmetrics library.
Almost metrics plugin support will be handled in
#statistics
methods. So, it won't be caused significant performance degradation.Docs Changes:
Needed.
Release Note:
Same as title.