fix(ops): hide percentiles in Live Ops Console when sample size is too small

[yatesjalex]

Summary

• The Latency tab in the Live Ops Console unconditionally rendered p50/p95/p99, so with n=1 it stamped the same number three times (e.g. p50 1182 ms p95 1182 ms p99 1182 ms). Mathematically correct (one sample → all percentiles equal that sample), but visually indistinguishable from a broken measurement.
• Switched LatencyRow to n=N last X ms when n < 5, and kept the percentile breakdown once there are enough samples for the numbers to differ meaningfully.

Why this looked "broken"

• deals.getActivityOfferPlacements gets a client-side sample only from the page-header Refresh button, a refetchOnWindowFocus, or a staleTime expiry — the SSR prefetch at page.tsx:28 bypasses the latencyLink.
• Clicking "Re-check attribution" fires the deals.simulatePartnerWebhook mutation, and its onSuccess writes events straight into the React Query cache (useApplyServerEvents.ts:32) — it never triggers a refetch of getActivityOfferPlacements, so that row stayed at n=1.
• With one sample, percentile() returns sorted[0] for every p — so the three percentiles were identical by construction.

Test plan

• pnpm typecheck
• pnpm test (327/327 pass; added cases cover both the n<5 and n≥5 branches)
• Open the Live Ops Console → Latency tab, confirm a single-sample row now reads n=1 last X ms instead of three identical percentiles, and that rows with ≥5 samples still show p50/p95/p99.

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Note

Low Risk
Low risk UI-only change in the Live Ops Console latency display; behavior is gated by a simple n < 5 condition and covered by updated tests.

Overview
Updates the Live Ops Console Latency tab to avoid misleading percentile output for tiny sample sizes: when n < 5, rows now render n=N last X ms instead of p50/p95/p99, while keeping percentile breakdown for n ≥ 5.

Adds/adjusts tests in LiveOpsConsole.test.tsx to assert the new last formatting for a single sample and that p50/p95/p99 appear once five samples are recorded.

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Project	Deployment	Actions	Updated (UTC)
super	Ready	Preview, Comment	Apr 23, 2026 7:12am