Horizontal scaling for large enterprise deployments
For use in very large enterprise deployments exceeding the capacity of a single Mattermost server and needing high availability and set up of redundant proxies, databases and application servers.
Should include availability of enterprise support, advisory and hardware-sizing guidance.
Now available in E20: https://docs.mattermost.com/deployment/cluster.html
Elias Nahum commented
I think the best here would be to decouple webapp, server and WS to enable horizontal scaling