Deploy a canary release of the application with the same configuration as the current production environment to identify the root cause of the incident.

Configure Google Cloud Pub/Sub to notify the on-call team when an incident is detected to reduce the mean time to resolution (MTTR).

Use GKE autoscaling to increase the number of replicas for the affected service to distribute the load evenly and improve application availability.

Create a postmortem report to analyze the root cause of the incident and implement corrective actions to prevent similar incidents in the future.

Perform a rolling update in the production environment to introduce a new, untested version of the application to resolve the incident.