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277f7c9655
The "Consensus Round Duration" panel plotted only p50 and p95. At the devnet rate of ~19 rounds/min, a single stalled round is one sample in several hundred, so p95 over a rate interval stays near the normal 2s close time and the stall is invisible. Measured on devnet-otel-usw2-02 over a 40 min window: 761 rounds, of which exactly one fell in the 7500-10000ms bucket while the mean never exceeded 2270ms. The histogram already records the outlier; only the panel could not show it. Add a p99 series alongside p50/p95 and retitle the panel accordingly. No metric or collector change: the existing consensus_round_duration_ms_bucket histogram already has 20 boundaries up to 120000ms.