We have in Moodle "cache locks" plugin. This is an empty category on plugins page: https://moodle.org/plugins/browse.php?list=category&id=47
Moodle core implements only one "cache lock" plugin under: cache/locks/file
The UI for configuring it is under https://demo.moodle.net/cache/admin.php :
My question is - where and how are those cache lock instances used?
Note: do not confuse (as I did) this locking with https://docs.moodle.org/dev/Lock_API , which is something else.