Option to block main thread when serving metrics

[NotAFile]

When writing exporters, I usually want the program to run indefinitely once I call start_http_server. Currently, I need to add a workaround using e.g. while True: sleep(100). It would be nicer if there was a block=True or similar kwarg which would hang the main thread instead.

This seems simple enough that I might try add it myself if I get a positive reaction.

[Shtsh]

signal.pause() would be a better solution

https://docs.python.org/3/library/signal.html#signal.pause

[brian-brazil]

It's one line of code for the user to add, so I don't see a big need to expand the API.