Pinterest hit a weird one-in-a-million query mismatch during its search infra move to Kubernetes. The culprit? A slippery timing bug.
To catch it, engineers pulled out every trick—live traffic replays, their own diff tools, hybrid rollouts layered on both the legacy and K8s stacks. Painful, but it paid off.
System shift: Search infra migrations are locking in a playbook: observability everywhere, mirror the traffic, roll things out like you mean it.
