One of the great things about Percona Monitoring and Management (PMM) is its flexibility. An example of that is how one can go beyond the exporters to collect data. One approach to achieve that is using textfile collectors, as explained in  Extended Metrics for Percona Monitoring and Management without modifying the Code. Another method, which is [&]

https://www.percona.com/blog/2019/03/12/pmms-custom-queries-in-action-adding-a-graph-for-innodb-mutex-waits/