Open Source tools to visualise MySQL/MariaDB performance metrics (show global status with interval)
Get MonYog through MariaDB.  https://www.webyog.com/product/monyog

Note: anything that works with MySQL, MariaDB, or Percona, will probably work well with the others.

I looked at lots of tools, but came away thinking that most graphs were measuring either stuff that never changes.  My favorite tool metric is the number of slowlog entries.  If that goes up, there are problems.  At that point, sometimes the other graphs lead to useful info, but usually fixing a query is the real solution to a performance problem.