ship dev to main: LKG fallback + cache-key purge (prod aggregate poisoned) - #1189
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… all-benchmarks aggregate
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Prod incident: the all-benchmarks aggregate cache holds 9 draft benches (poisoned during an SRH congestion window at 20:03 UTC) and every revalidation throws AllBenchmarksDraftError, preserving the poison indefinitely. No revalidation route exists; the repo pattern is a cache-key bump + deploy.
Ships dev (all staging-gated benches stay hidden on prod via REMOVED_BENCH_SLUGS) including:
Infra fixes already applied VPS-side: SRH_CONNECTION_POOL_SIZE=25 (root cause), worker on direct TCP.