App services CI/CD is not working as expected

Question

Hi all.

I've been having a strange problem where my ci/cd is not working as expected.

I have an App service (linux) running 3 instances. that's pointing to a docker container in my azure registry. When I push a new image of that container to the registry I can see that the webhook is sent and on occasion 1 or 2 of the instances will pick up the new container image and start running it. But quite often 1 instance will simply do nothing.

My docker image is always tagged with the same tag (think imagename:latest)

What I've tried

• Restarting the app service - sometimes fixes the issue
• Shutting down and starting back up the app service - fixes issue
• Return an error from the /health endpoint - does not fix the issue. The instance is not replaced by another even after waiting for 5 days