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The migration cut p95 latency by 38%, but error rate doubled in the first hour, and the old retry path was removed. A plain neutral highlight stays monochrome, while a boxed note reads as an aside.
On load, this drawn highlight sweeps in (and respects reduced motion).
Source Q3 incident review, §4 — the regression was sustained for 47 minutes before rollback.
Caveat Sample size below 1,000 events; treat the percentile as indicative.