In the previous posts of this series, I presented how the Percona Support team approaches the analysis and troubleshooting of a MySQL server using a tried-and-tested method supported by specific tools found in the Percona Toolkit: Inspecting MySQL Servers Part 1: The Percona Support Way Inspecting MySQL Servers Part 2: Knowing the Server Inspecting MySQL [&]

https://www.percona.com/blog/inspecting-mysql-servers-part-5-percona-monitoring-and-management/