prometheus: Histograms: Use more buckets #624
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This PR introduces more buckets for timing histograms. It does not change the density, it only introduces buckets for larger values.
Prior to this PR, the highest-value bucket had a lower boundary of 10^0.9 = 7.94s. In a recent high-load situation, block processing in sapphire took longer than that, leading to clipped graphs in Grafana.