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@Jain@blob.cat @vib@fedi.absturztau.be @puniko@mk.absturztau.be
not custom, it's in main
this is the primary commit: https://akkoma.dev/FoundKeyGang/FoundKey/commit/91a4f38871e4f39fc30e943fa913dd9ab43cc600 (minus cleanup)
the tl;dr is that we already keep a statistic for "the last time we successfully communicated with an instance" (receiving an activity, sending an activity without an error, etc)
if the last time that has happened is > a month, the instance is considered "dead for now" and we stop sending activities (exactly the same way as if it was suspended via the "stop sending activities" button)
all that it takes to undo that is for us to receive an activity from them
iirc a fetch (e.g via search or querying a user) should be sufficient, or to just have them send us something
i.e truly automated "dead instance detection"