Thank you @andreas-doehler, issuing web requests is something I didn’t consider at all. But you’re right: such a ‘polling’ solution is better than nothing as long as it does the job.
Is this call also available inside the check_mk/webapi.py namespace? This would save me from fiddling with session cookies or any special requirements of the web frontend - it would feel more portable.
By the way, I did not get CMK to alert me whenever a label changed its value - only if a label appears or disappears. I guess, labels are a moving target for now, and I’ll investigate how the handling will be changed in the near future.
Thanks again,
sultansofswing.