Hi Julius,
while I am not aware of anything that comes out of the box one approach could be to parse the logs for a specific pattern which signalizes that the user directory sync failed. Upon that finding you could page an admin.
As this is outside of the "actual" Confluence product there are surely tons of how-tos out there. I'd start with a script in a scripting language that you are comfortable with (Bash/Python/...) for this requirement. When finished calling it from a Cronjob (hourly or so) should do the job.
Of course, in case you have a bigger monitoring solution in place you could integrate with it also.
Cheers,
Daniel
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