Why OMV4 prohibits capital letters for UPS identifer pattern ?
It has been that way back to OMV 0.5 (and maybe earlier). It might have something to do with rrdcache. Not really sure. Why do you need capital letters?
Ok, thanks just to inform you about that : all of my 5 servers omv <=3.x use upper case letters for UPS identifier. This is the first time I see this pattern limitation with 4.x