What is the first step to take when resolving a connectivity issue for a mobile app across Google Cloud regions?

To begin resolving a connectivity issue for a mobile app across Google Cloud regions, rerouting user traffic from the affected region to other regions is a strategic step. This action helps in minimizing the impact on users and ensures continued accessibility to the application, thereby maintaining a seamless user experience even while the issue is being diagnosed and addressed.

By directing users away from the problematic region, you can alleviate immediate user impact and begin gathering data without the pressure of ongoing connectivity problems. Rerouting allows development and operations teams to focus on troubleshooting the root cause without the added pressure of active user traffic contributing to the issue.

In contrast, checking Cloud Monitoring for CPU or memory spikes in the affected region can provide insights into resource utilization and potential performance issues, but addressing connectivity concerns often requires immediate actions that affect user traffic. Adding additional nodes to the Kubernetes cluster may be necessary if resource limitations are identified, but it is typically a response to a confirmed issue rather than a first step. Inspecting error messages using Cloud Logging is essential for understanding what went wrong, but this insight is more effective after you have rerouted users to maintain service continuity.