Clarifications and issues on performance page

Ernst van Nieroprequested to merge
evn-perf-page into master

\cc @timzallmann @jschatz1 this does need your review :-) Stand by, I will ping you in specific sections of the diff.

Will partially close https://gitlab.com/gitlab-com/infrastructure/issues/2373

Closes https://gitlab.com/gitlab-com/infrastructure/issues/2372

Edited by Ernst van Nierop

Merge request reports