Notes - Daniel-Brosnan-Blazquez/vboa GitHub Wiki
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Really good thread on left lock files forever:
https://openstack.nimeyo.com/67057/openstack-dev-oslo-all-the-lock-files-saga-and-where-from-here
Removal of lock files seems to be something really complicated to accomplish and really a cosmetic issue.
So a proposed solution could be to remove lock files which were not used in a week after locking them.
The race condition during this operation in this system should be really remote to non-existent.