2026-01-09: No runner jobs traffic for ci_runner_jobs on private shard in past 30 minutes

No runner jobs traffic for ci_runner_jobs on private shard in past 30 minutes (Severity 3)

Problem: CI runner jobs stopped being processed on the private shard, with traffic dropping abruptly to zero.

Impact: No CI runner jobs were processed on the private shard for at least 30 minutes. Jobs intended for the private shard were handled by the shared shard during this period.

Causes: A configuration change was made that did not update the correct shards, causing all runner jobs to be routed away from the private shard.

Response strategy: The team is starting the correct shard to restore job processing.

This ticket was created to track INC-6503, by incident.io 🔥