I'm using GCP's an unmanaged HTTP external load balacer, and I have several Nginx servers running on its backend.
I wanted to check the logs for changes in the health status of the Nginx servers, but could not find a way to do so.
First, I enabled logging for the health check assigned to the backend service. Then, I stopped the service of one Nginx server to test it. Then I selected GCE Health Check from the Resource Type in the Logs Explorer, but only logs related to the creation, update, and deletion of the health check itself appeared.
Next, I enabled logging for the backend service and did the same experiment. However, similarly, only logs related to the creation, update, and deletion of the backend service itself appeared.
I have three questions:
- Doesn't the logging of the health check log the changes in the health status of the monitored service?
- Doesn't the logging of backend services log the health status changes of the instances belonging to the backend?
- How can I check when each Nginx server became unhealthy and when it became healthy in the log?
