If you only have 1 instance in 1 region, and metrics show that you have enough ram/cpu then maybe try increasing concurrency setting via fly config?
I found that default concurrency setting might be a bit low for my use cases. Especially if you’ve increased your instance ram. (In my case my apps are just some glue between database and a client, so if bottleneck will occur it’s likely gonna be database)
now, the log say
Error 1002: No suitable (healthy) instance found to handle request
Looks like a different problem, probably some application error?