It seems that when I do Scheduled Maintenance for any device that during that window metrics are not collected. I tried to see what the documentation would say on this matter, and found “Scheduled Maintenance” completely undocumented. Google-Fu nothing really turned up either.
Is there any way I can still collect metrics (where possible) from devices in a Scheduled Maintenance window, and of course without Alerting? I prefer to minimise gaps in my graphs as much as possible.