PMM Server
See the PMM docs for more information.
If you find a bug in Percona Monitoring and Management Server or one of the related projects, you should submit a report to that project's JIRA issue tracker.
Your first step should be to search the existing set of open tickets for a similar report. If you find that someone else has already reported your problem, then you can upvote that report to increase its visibility.
If there is no existing report, submit a report following these steps:
An excellent resource is Elika Etemad's article on filing good bug reports..
As a general rule of thumb, please try to create bug reports that are: