[erlang-questions] how to check if an application has been upgraded

[Benoit Chesneau]

I am for now polling from time to time the applications I have registered
to watch if one have been upgraded and then optionally discover some
resources from it. But I am wondering if  there is a bette  way to know if
an application have been upgraded, or restarted from another application.

Or rather what would be the more efficient way to do it?

- benoît
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