[vdusek]

test_stall_waits_for_in_flight_work flaked on macOS / 3.11 (run) with DID NOT RAISE PersistentRateLimitError. The test used a 50-100 ms real-time backoff. On a slow runner it ran out before the crawler checked whether the domain was held back, so every attempt counted as an ordinary error, the request failed, and no stall was ever raised.

The test now runs the throttler on a stopped clock, like open_throttler_held_until_reclaim and #2331. Each reclaim moves the clock one backoff forward until the domain has been rate-limited longer than max_domain_stall. After that the clock stays put, so the request waits in its cooldown as a stalled domain and doesn't cycle into MAX_HANDLER_CALLS.

Local runs couldn't reproduce the flake on their own. Delaying is_throttled by 120 ms reproduces the CI failure every time. With that delay the fixed test passes, and it passed 128 of 128 runs under CPU oversubscription. It still fails if the crawler raises a stall while a request is in flight.

✍️ Drafted by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.14%. Comparing base (449b82b) to head (ab1e102).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2355      +/-   ##
==========================================
+ Coverage   94.10%   94.14%   +0.03%     
==========================================
  Files         184      184              
  Lines       13647    13647              
==========================================
+ Hits        12843    12848       +5     
+ Misses        804      799       -5     

Flag	Coverage Δ
unit	94.14% <ø> (+0.03%)	⬆️

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[Mantisus]

LGTM

[apify-approval-mirror]

Mirroring approval from @Mantisus.