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Retry 503 with Retry-After, concurrency 4, 45s timeout, jitter - #4
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lookup.disclose.io sheds work with 503 lookup-overloaded when its ~8 resolver slots are full. dio-lookup retried only 429, so a shed host came back as an error row. Lookups can take ~30s, so give up no sooner than 45s, and default to 4 workers so a single scan does not occupy every slot.
Workers shed in the same instant otherwise retry in the same instant.
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lookup.disclose.io sheds with
503 lookup-overloadedwhen its ~8 resolver slots are full (120 in the week to 2026-10-09). dio-lookup retried only 429, so shed hosts became error rows.Retry-After(capped 30s) plus up to 1s jitter.Tests: 22/22; a mutant without the 503 retry fails the new test. Companion: disclose/lookup.disclose.io fix/overload-503 (Retry-After now 15s).