Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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The error explains the issue, it has started the container but it is not responding to any http pings on port 8080 (which I assume is the port you specified that your application is running on in the container). It's failed this health check so cannot start.
You need to look at your container and check that the application is running on the correct port, and look at the container logs to see why it may not have started.