As an admin, I would like to be able to run a hook script on a periodic basis, not tied to a specific job context or job lifecycle event

be able to create a server periodic hook, add execution frequency to it, enable/disable the hook

the hook script execution itself must not block other PBS operations

execution of a periodic server script must not block other hook scripts from launching, provided they belong to different hook objects

allow only one instance of the hook script belonging to each server periodic hook object to run at any given time