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Changes CHG-48

Tighten timeout handling

Resolved

#1849 @maya v2.14.0 Deployed Sep 15 at 09:41 # eng-checkout checkout-api

Summary

Strict timeouts for checkout's downstream calls

Expectations

Checkout calls use the new timeout Verified

Checkout p95 latency stays at baseline Anomaly found

p95 latency 182 ms → 511 ms

200 ms 400 ms PR #1849
09:2009:3009:4009:5010:0010:1010:2010:30

The fix

Resolved

PR #1893: Revert CHECKOUT_V2_STRICT_TIMEOUT

  1. 10:22 Cleric opened the fix PR
  2. 10:31 Approved by Maya
  3. 10:52 Deployed and verified, p95 back to 180 ms
Thread #eng-checkout

Cleric APP 9:50 AM

⚠️ Anomaly found: p95 up after PR #1849

1 reply

Cleric APP 10:52 AM

Resolved: the regression I flagged has been fixed.

  • Intent: strict timeouts, verified
  • Regression: p95 +329 ms, now fixed, back to 180 ms
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Change Verification · PR #1902 Release verified

cart-apiBatch price lookups

What Cleric is checking

Read from the PR when it merged.

Cart load p95 No increase Price mismatches Stays at zero DB connections Within pool limit

Checks over 14 days

Day 14 of 14
  1. Day 1 Deployed · first check passed
  2. Day 3 Weekday peak traffic · passed
  3. Day 7 Full sales cycle · passed
  4. Day 14 Window closed · no deviation
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On-call · last 24 hours Live

47 alerts reached Cleric

41 Closed as false positive
5 Investigated and fixed by Cleric
1 Escalated to an engineer
INV-1247payment-api 02:31

The one that reached you · p99 latency regression

Why you Rollback needs a schema decision Cause Retry storm, PR #470 Evidence 7 signals attached
Open investigation
Engineers woken for noise: None

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PR #1893checkout-api Ready for review

RevertCHECKOUT_V2_STRICT_TIMEOUT

config/checkout.yaml 1 file changed
-strict_timeout: true +strict_timeout: false

Why this fixes it

p95 latency rose 4 min after deploy Isolated to checkout-api Same revert fixed INV-1182

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