Thanks for asking question! Looking internally for App service name : ngs-tfs-appservice-p it seems your application process was responding slow and more than 80% of the requests to the application was taking over 200 seconds in 5 minute interval.
Suggest you to Open Web App Slow Tab under Diagnostics and solve problems blade to check app latency and analyze common patterns that cause your app to respond slowly Platform proactively healed your application by restarting the application process on affected instances.
This occurred multiple times during the day across multiple instances.
Let us know if you have further query or issue remains.