pt-k8s-debug-collector requires mysql client

Documentation lists only these three components as required:

• kubectl
• pt-mysql-summary
• pt-mongodb-summary

However, it is possible to install pt-mysql-summary on instances without a mysql client and collection of data using the tool will not be useful.

jerichorivera@cthulthu:~/Downloads/cluster-dump$ cat default/cluster1-pxc-0/pt-summary.txt
error: exit status 1, stderr: 2021_01_20_11_16_04 Cannot execute mysql. Check that it is in PATH.
, stdout:

I have not tested from a MongoDB cluster yet however based on pt-mongodb-summary it uses Go mongodb drivers unlike pt-mysql-summary which calls the mysql client so it may not be required to have the mongo client for it to work.