eth/protocols, metrics: use resetting histograms for rare packets #22586
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holiman
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This PR "fixes" the previous histograms by resetting them upon each pull/push.
The same way as with timers, the metrics library assumes that there's a constant stream of events we monitor. If a metric gets updated very rarely (e.g. eth/64 header request), the chart will be skewed because the metric will report the same value over and over and over ad infinitum (decaying ever so slowly to 0).
This PR uses @nonsense's resetting idea, just for histograms to reset them on retrieval.
The diff is visible on the screenshot below. The code was updated to this PR in the middle on the displayed run.