Ben Kochie 7d542fec67 Update cache metrics (#4781) ...

Add a total cache request counter to follow Prometheus conventions[0].
Mark the existing cache miss metric as deprecated.

> Similarly, with hit or miss for caches, it’s better to have one
> metric for total and another for hits.

[0]: https://prometheus.io/docs/instrumenting/writing_exporters/#naming

Signed-off-by: SuperQ <superq@gmail.com>

2021-08-16 13:54:36 +08:00

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