My org has been using Rocket chat for about a year now, and it's been surprisingly workable. The mobile clients suck and are pretty limited. But the Mongo DB cl

My org has been using Rocket chat for about a year now, and it's been surprisingly workable. The mobile clients suck and are pretty limited. But the Mongo DB clustering has been suprisingly stable and hands-off. I'm not sure what server requirements you are talking about, but we have a three node cluster where each node has 3vcpus,and 3GB of RAM and we've not experienced any resource problems. The only added complexity beyond the core mongo cluster is we have to sync uploaded files/avatars using lsyncd since we want this service to be up even if our NFS servers are having problems.