Merge branch 'eread/split-gitaly-and-gitaly-cluster-troubleshooting-information' into 'master'

Split Gitaly and Gitaly Cluster troubleshooting information

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141956



Merged-by: Fiona Neill <fneill@gitlab.com>
Approved-by: Fiona Neill <fneill@gitlab.com>
Co-authored-by: Evan Read <eread@gitlab.com>