[Meta] GitLab.com performance
- Successor to "GitLab.com Latency" #947 and "Back calculate gains needed" #1830.
- Action items are also to be listed on https://about.gitlab.com/handbook/engineering/performance
### Analysis to be done
- Analyze transaction time and correlation with rails controller time #1877
- Analyze reasons for performance difference on two issues, as case study #1880
### Monitoring to be added - included on handbook/engineering/performance
- Gather monitoring data for longer time periods #1879
- Enable Prometheus collection of InfluxDB metrics #1022
- Allow more GitLab internals monitoring https://gitlab.com/gitlab-org/gitlab-ce/issues/28465
- Making workhorse timings available https://gitlab.com/gitlab-com/infrastructure/issues/2025
### Tracking ongoing efforts - all listed on the engineering handbook page.
- [meta] Overview of top 10 slowest queries https://gitlab.com/gitlab-org/gitlab-ce/issues/34535
- [meta] Scoping work on completing the transition to Gitaly https://gitlab.com/gitlab-org/gitaly/issues/313
- [meta] Frontend Performance Audit https://gitlab.com/gitlab-org/gitlab-ce/issues/33958
- Setting up CDN for GitLab.com #2092 (successor to #57 )
- Compressing html with gzip in nginx https://gitlab.com/gitlab-org/gitlab-ce/issues/33719
- Slow SSL Connection Establishment #2321
\cc @gl-infra @sitschner @stanhu @sytses @bjk-gitlab
issue