re-implement prometheus metrics endpoint to be simpler (#13922)

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data-structures were repeatedly initialized
this causes GC pressure, instead re-use the
collectors.

Initialize collectors in `init()`, also make
sure to honor the cache semantics for performance
requirements.

Avoid a global map and a global lock for metrics
lookup instead let them all be lock-free unless
the cache is being invalidated.

...

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Harshavardhana authored and GitHub committed 2021-12-17 10:11:04 -08:00

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commit 818f0201fc

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cmd/metrics-v2.go

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