smalenfant opened a new issue, #7228:
URL: https://github.com/apache/trafficcontrol/issues/7228

   ## This Improvement request (usability, performance, tech debt, etc.) 
affects these Traffic Control components:
   
   - Traffic Control Cache Config (`t3c`, formerly ORT)
   - Traffic Ops
   - Traffic Portal
   
   ## Current behavior:
   
   t3c today is updating max origin connection when a mid cache status changes 
and then the CDN is sent a queue update. This works in most of the cases 
although we've seen this creating issues under router maintenances/outages for 
example where half of our mid caches in a region would fall offline. During 
these events, we have seen that the max origin thresholds were reached for the 
duration of the event causing preventable errors.
   
   I'd like to note that some Mid cachegroup are more loaded than others and 
that origin connections max exceed in some groups than some others. I'm not 
sure exactly how this could solved.
   
   ## New behavior:
   
   Get the OFFLINE/ADMIN_DOWN status from Traffic Monitor (Is there a TO API?) 
and t3c could automatically apply (without queue update).
   
   Note: This would supersede #6248


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