We have 3/4 applications generating data for Kibana.
Each application have at least one dashboard with 10/12 visualizations...
So, we have 4-6 Dashboards and a lot of visualization (more then 60) and it's very difficult to manage.
If we have multiple instance on the same server, we can manage per application.
We don't want to install 3/4 kibana because we don't want to deal with the port (ex: kibanaserver.url:80/, kibanaserver.url:90/,....)