For Brandmeister, you can see all server statuses on the central
http://brandmeister.network/
page (click on the masters tab). Also you can see the metrics on
http://metrics.brandmeister.network
I don't know if there is something like these for DMRplus exists.
I use this page for DMR+ but it's not terribly clear:
http://uk-dmrplus.opendmr.net/
You can see some of the network information including a list of masters here:
http://uk-dmrplus.opendmr.net/rpt_online.html
These seem to be mainly Hytera repeaters, I don't know if a BM master is physically the same but I know that Phoenix in the UK had to purchase C-bridge software to connect their network to DMR-MARC. All these different pieces of network make it all a bit difficult to understand what does what exactly.
--
Brian