Timeouts are tricky to debug. One option could be an infinite loop, or
hitting a remote service on startup that is slow or taking a long time.
Another possibility would be something like building a big index, which may
not run infinitely, but if it takes more than 20 seconds we assume a
timeout.
How would one figure out the following error for an app error'ing out
on Heroku, that runs ok locally? "App boot: Exception caught- App
failed to start / Server timed out to start". This is the only error
message information provided; not much to go on.
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