Monitor the health of App Service instances - Azure App
https://docs.microsoft.com/en-us/azure/app-service/monitor-instances-health-check
When given a path on your app, Health check pings this path on all instances of your App Service app at 1-minute intervals. If an instance doesn't respond with a status code between 200-299 (inclusive) after two or more requests, or fails to respond to the ping, the system determines it's unhealthy and removes it. When given a path on your app, Health check pings this path on all instances of your App Service app at 1-minute intervals. If an instance doesn't respond with a status code between 200-299 (inclusive) after two or more requests, or fails to respond to the ping, the system determines it's unhealthy and removes it. After removal, Health check continues to ping the unhealthy instance. If the instance begins to respond with a healthy status code (200-299) then the instance is returned to the load balancer. If an instance remains unhealthy for one hour, it will be replaced with new instance.
When given a path on your app, Health check pings this path on all instances of your App Service app at 1-minute intervals.
If an instance doesn't respond with a status code between 200-299 (inclusive) after two or more requests, or fails to respond to the ping, the system determines it's unhealthy and removes it.
After removal, Health check continues to ping the unhealthy instance. If the instance begins to respond with a healthy status code (200-299) then the instance is returned to the load balancer.
If an instance remains unhealthy for one hour, it will be replaced with new instance.
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