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cache: explore better ways to detect cache changes made by other processes
kresd 5.2.0 does periodic check which might take too long on very busy systems. Maybe we could use some event-based mechanism? See [discussion](https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1042#note_168310). The following discussion from !1042 should be addressed: - [ ] @pspacek started a [discussion](https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1042#note_168310): (+1 comment) > Why not use https://docs.libuv.org/en/v1.x/guide/filesystem.html#file-change-events ?
issue