Slack Thread: Authentication Service Follow-up 19

Date: 2026-01-26 Channel: #team-service-review Service: Authentication Service Incident Reference: INC-2026-109 Jira Reference: ACME-1019 GitHub Reference: GH-1003

Sam Rivera: We are reviewing INC-2026-109 for Authentication Service. The main concern is whether the remediation in ACME-1019 also covers downstream impact to Checkout Service and Billing Service.

Jordan Kim: I checked traces for Authentication Service, Inventory Service, and Notification Service. The correlation IDs line up with the incident timeline, but the highest error rate stays inside Authentication Service.

Maya Chen: Please make sure GitHub item GH-1003 includes contract tests for API API-AUTHENTICATION-04 and an update to the runbook.

Devon Patel: Agreed. I will add release readiness notes, dashboard screenshots, and a rollback checkpoint before this goes to canary.

Priya Shah: Decision: keep ACME-1019 open until staging replay passes and the incident review confirms no unsupported customer-impact claims.