I try make nice timechart how many objects are unavailable in specific time.
In my log I have start and end events from every outages and they are binded nicely together. Also I have calculated how long these outages are (in minute accuracy).
When I try to drad timechart with :
I've got line stay up whole day. If I add span=15min (the accuracy what I want), I got only small spikes(15min), even those outages are 4 or 5 hours long.
Restaurant have log on every seat when customer sit down and stands up. Every customer uses different time when they are eating. I want know how many customer we have in specific 15min timewindow in graph.
With that you will have what are the concurrent elements in a certain frame of time. Calculating how much is really used in each bucket will be like the calculation of in the previous answer of duration_bucket.
Well what I understand of that blog was "you should check status of your monitored item every second, if you want good occupacy report". I can't agree more that it is most reliable way to do that. I am not sure how vice it is when I have 1000+ items to look after.