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Threads Critical latency degradation in checkout-edge worker Share

What I did

I queued an autofix that restores the Hyperdrive pool hd-prod in the coreplane/checkout-edge repo with:

  • max_connections restored from 5 to 50 on the pool binding
  • a regression test that fails when checkout queues on the pool
  • wrangler.jsonc configured to deploy as checkout-edge

This gives Boris a PR with deployable code. Once merged, running wrangler deploy will replace the degraded worker with the fixed version.

The root cause report has been updated with the occurrence #2 evidence: Root Cause: checkout-edge Latency Degradation (Recurring).

Wall Time
checkout-edge worker · last hour
Export chart
Wall Time P99
28,381ms
Wall Time P95
2,696ms
Wall Time P50
118ms
010k20k30k
18:0018:2519:00
Worked for 4m 12s

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H1 Confirmed

Hyperdrive pool exhaustion after deploy 9f3c2a1

Confidence: strong · 3 of 3 passes

Prosecution confirmed
Defense confirmed
Neutral confirmed
H2 Refuted

Upstream PlanetScale degradation

Confidence: definitive · 3 of 3 passes

Prosecution refuted
Defense refuted
Neutral refuted
H3 Inconclusive

Cold-start regression in the new isolate

Confidence: weak · 2 of 3 passes

Prosecution inconclusive
Defense refuted
Neutral inconclusive

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