Fix health checks not working behind load balancers

Closes #58573

See merge request gitlab-org/gitlab-ce!26055

Seed tablesample strategy

Closes #58791

See merge request gitlab-org/gitlab-ce!25966

The change in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24199 caused
requests coming from a load balancer to arrive as 127.0.0.1 instead of
the actual IP.

`Rack::Request#ip` behaves slightly differently different than
`ActionDispatch::Request#remote_ip`: the former will return the first
X-Forwarded-For IP if all of the IPs are trusted proxies, while the
second one filters out all proxies and falls back to REMOTE_ADDR, which
is 127.0.0.1.

For now, we can revert back to using `Rack::Request` because these
middlewares don't manipulate parameters. The actual fix problem involves
fixing Rails: https://github.com/rails/rails/issues/28436.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58573

This produces stable approximate counts among invocations unless the
table changed.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58791.

Merge branch '58739-hashed-storage-prevent-a-migration-and-rollback-running-at-the-same-time' into 'master'

Hashed Storage: Prevent a migration and rollback running at the same time

Closes #58739

See merge request gitlab-org/gitlab-ce!25976

Backports EE change for expanded pipelines

See merge request gitlab-org/gitlab-ce!26043

Allow gitlab:ui:visual to fail

See merge request gitlab-org/gitlab-ce!26042

Cache Repository#root_ref within a request

Closes #58684

See merge request gitlab-org/gitlab-ce!25903

Fix counting of groups in admin dashboard

Closes gitlab-ee#7435

See merge request gitlab-org/gitlab-ce!26009

Resolve CE to EE differences in the lib/api directory

See merge request gitlab-org/gitlab-ce!25430

This is a small polishing on the storage migration and storage rollback
rake tasks. By aborting a migration while a rollback is already
scheduled we want to prevent unexpected consequences.

Remove some easy factories from migration specs

See merge request gitlab-org/gitlab-ce!26025

Remove fake repository_path response - resolved issue# 50386

Closes #50386

See merge request gitlab-org/gitlab-ce!25942

The repository_path is no longer needed since
https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/231, which closes
https://gitlab.com/gitlab-org/gitlab-shell/issues/135.

Authenticate the internal API using a header

See merge request gitlab-org/gitlab-ce!25924

When an empty project is loaded in the UI, there are 15 separate Gitaly
FindDefaultBranch calls to determine the root_ref. Previously, it was
not cached even within the request. This change caches it within the
request so only a single FindDefaultBranch RPC is needed.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58684

Update feature proposal template with "Intended users"

See merge request gitlab-org/gitlab-ce!25906

Revert "Merge branch 'gitaly-version-v1.28.0' into 'master'"

See merge request gitlab-org/gitlab-ce!26037

Update rack-oauth2 1.2.1 -> 1.9.3

Closes #21732

See merge request gitlab-org/gitlab-ce!17868

Fixed sticky headers in merge request creation diff

Closes #57691

See merge request gitlab-org/gitlab-ce!26027

This reverts merge request !26026

Merge branch '58797-broken-ui-on-a-closed-merge-request-from-a-deleted-source-project' into 'master'

Fix UI for closed MR when source project is removed

Closes #58797

See merge request gitlab-org/gitlab-ce!25967

Tag asset docker image with GitLab version also

See merge request gitlab-org/gitlab-ce!26029

Quarantine failing test

See merge request gitlab-org/gitlab-ce!26028

Upgrade Gitaly to v1.28.0

See merge request gitlab-org/gitlab-ce!26026

Keep inline as much as possible in system notes on issuable

Closes #58789

See merge request gitlab-org/gitlab-ce!25968

Use curl silent/show-error options on Auto DevOps' deploy

Closes #58781

See merge request gitlab-org/gitlab-ce!25954

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

CE port for expanded pipelines

See merge request gitlab-org/gitlab-ce!25859

Fixed Web IDE web workers not loading with relative root URL

Closes #50451

See merge request gitlab-org/gitlab-ce!26015

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57691

Revert "Merge branch 'check_pg_stat_activity' into 'master'"

See merge request gitlab-org/gitlab-ce!26016