Percy Wegmann 5095efd628 prober: make histogram buckets cumulative
Histogram buckets should include counts for all values under the bucket ceiling,
not just those between the ceiling and the next lower ceiling.

See https://prometheus.io/docs/tutorials/understanding_metric_types/\#histogram

Updates tailscale/corp#24522

Signed-off-by: Percy Wegmann <percy@tailscale.com>
2024-12-20 10:28:37 -06:00
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