Change cron from '10,30,50' (3 fires/hour) to '2,12,22,32,42,52'
(6 fires/hour). All new slots are 1-3 min away from any other
cron, avoiding both the cf-sweep collisions (:15, :45) and the
:30 heavy slot (canary-staging /30, sweep-aws-secrets,
sweep-stale-e2e-orgs every :15).
Why: empirically 2026-05-04 the canary fired only once per hour
on the 10,30,50 schedule (see #2726). Bumping fires-per-hour
gives more chances to land a survived fire under GH's load-
related drop ratio, and keeping all slots in clean lanes
minimizes the per-fire drop probability.
At empirically-observed ~67% drop ratio, 6 attempts/hour yields
~2 effective fires = ~30 min cadence; closer to the 20-min
target than the current shape and provides a real degradation
alarm if drops get worse.
Cost: ~$0.50/day → ~$1/day. Negligible.
Closes#2726.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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