Reload / reattach when pinned maps change

[arthurfabre]

Pinned hook maps exposed by long running daemons may change from under us, for example due to a graceful reload or configuration change.

Monitor the pinned maps (inotify?), and if they are replaced with new maps reattach the capture programs.

[lmb]

Another option: make hooks re-use pinned maps if possible, and hope that this is enough 90% of the time?