Use Prometheus Histogram metric instead of Summary

[learnjin]

because 'averaging the quantiles yields statistically nonsensical values.' We can calculate the cumulative aggregated p99 or pX on the server side.

Details see here: https://prometheus.io/docs/practices/histograms/

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[slot]

Please fix you commit message with git commit --amend it should be like refactor(metrics): Use Prom...

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