Checkout failures in ap-south
Payment completion is degraded for India storefront traffic.
What we know
EV-0114:06:12 UTCAlertCheckout API error rate crossed 18.4% in the ap-south production region.
EV-0214:04:39 UTCChangeWorker concurrency was reduced from 48 to 12 during CHG-8824 rollout.
EV-0314:03:55 UTCMetricQueue depth increased 7.6× while worker CPU remained below 34%.
EV-0414:02:18 UTCLogPayment callbacks show repeated timeout retries without downstream declines.
Ranked hypotheses
Worker pool saturation after configuration change
The queue increase begins within two minutes of CHG-8824. Low CPU and callback retries indicate insufficient worker concurrency rather than downstream payment failure.
EV-02EV-03EV-04Transient payment gateway latency
Callback timeouts are consistent with gateway latency, but current evidence does not show provider-side declines or a matching external status event.
EV-01EV-04Restore worker concurrency to 48
Revert the CHG-8824 concurrency setting, monitor queue depth for five minutes, and stop automatically if payment error rate increases.
Investigation activity
run_01J6DXA1P4Reference workspace data demonstrates the Incident Intelligence contract. Live sources activate after connector and identity configuration.