Reduce cardinality of some of GitLab's Prometheus metrics and fix observed duration reporting.

Closes #41045

See merge request gitlab-org/gitlab-ce!15881

(cherry picked from commit 92e15071)

e391fe1d Reduce cardinality of gitlab_cache_operation_duration_seconds histogram
b02db1f4 Fix gitaly_call_histogram to observe times in seconds correctly
a8ebed60 Make `System.monotonic_time` retun seconds represented by float with microsecond precision
3c545133 Fix tests and formatting
ed715b79 use in_milliseconds rails helper
040167f0 Use seconds where possible, and convert to milliseconds for Influxdb consumption
10af36f0 add missing word to pawel-reduce_cardinality_of_prometheus_metrics.yml

Execute project hooks and services after commit when moving an issue

Closes #41324

See merge request gitlab-org/gitlab-ce!16108

(cherry picked from commit 87dbf984)

16b8297e Execute project hooks and services after commit when moving an issue

Fix cluster enviroment missing

See merge request gitlab-org/gitlab-ce!15973

(cherry picked from commit 888ed309)

9616e70a Allow environment_scope in cluster controllers
8a13ef41 Add environment scope field to cluster forms
56f719f8 Revert save button caption change
dd66c6a2 Use helper for feature check in cluster partials
2b45ae09 Hardcode clusters helper in CE
ecba48bd Inverse the has_multiple_clusters? helper usage

[ci skip]

Fixed diff_worker not compiling correctly

Closes #41182

See merge request gitlab-org/gitlab-ce!15966

(cherry picked from commit baa6438b)

df4fe43d Fixed diff_worker not compiling correctly
a69e7aff changed webpack config

Migrate to Project#empty_repo?

Closes #41326

See merge request gitlab-org/gitlab-ce!16054

(cherry picked from commit e0a27ee4)

338f1eaf Migrate to Project#empty_repo?

Removes changelog entry for !15788

See merge request gitlab-org/gitlab-ce!16091

Reverting https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15788

See merge request gitlab-org/gitlab-ce!16088

CE: Fall back to the `MergeRequestWidgetEntity`

See merge request gitlab-org/gitlab-ce!16077

When no serializer was passed.

Prepare 10.3 RC4 release (initially planned to be RC3)

See merge request gitlab-org/gitlab-ce!16000

Use Gitaly 0.59.2 in 10-3-stable

[ci skip]

See merge request gitlab-org/gitlab-ce!16039

Removes AddTimezoneToIssuesClosedAt migration and respective cleanup post migration for C

See merge request gitlab-org/gitlab-ce!16021

Clear caches before updating MR diffs

See merge request gitlab-org/gitlab-ce!15916

Use memoization for commits on diffs

See merge request gitlab-org/gitlab-ce!15857

fix the commit diff discussion sending the wrong url

See merge request gitlab-org/gitlab-ce!15988

(cherry picked from commit f7a9ced2)

c77083a4 fix the commit diff discussion sending the wrong url
a794b161 rework the merge_request_version_params to use Object#tap

Stop sending milestone and labels for Projects::MergeRequestsController#show.json requests

See merge request gitlab-org/gitlab-ce!15847

(cherry picked from commit 3870a1bd)

cba40a1f Stop sending milestone and labels data over the wire for MR widget

Avoid running autodevops sast job on GitLab CE

Closes gl-sast#3

See merge request gitlab-org/gitlab-ce!15962

(cherry picked from commit 169a8c35)

8153f734 Avoid running autodevops sast job on GitLab CE

Filter by subgroup name before determining if our group has a subgroup

See merge request gitlab-org/gitlab-ce!15969

(cherry picked from commit 30696747)

643dca1c Filter by subgroup name before determining if our group has a subgroup

Don't use Markdown cache for stubbed settings in specs

Closes #41130

See merge request gitlab-org/gitlab-ce!15954

(cherry picked from commit dc17e7d7)

10885edf Don't use Markdown cache for stubbed settings in specs

Add SAST docs

Closes gitlab-ee#4125

See merge request gitlab-org/gitlab-ce!15859

(cherry picked from commit 0b19319b)

a862a21f Add SAST docs

Make sure user email is read only when synced with LDAP

Closes #41033

See merge request gitlab-org/gitlab-ce!15915

(cherry picked from commit d39d968b)

481b8a71 Make sure user email is read only when synced with LDAP

Add note about automatic pipelines when enabling Auto DevOps

See merge request gitlab-org/gitlab-ce!15946

(cherry picked from commit 6547f549)

8de4cb57 Add note about automatic pipelines when enabling Auto DevOps
bfa4fa91 Move note on automatic pipelines further below

Docs update documentation guidelines

See merge request gitlab-org/gitlab-ce!15811

Add commit diff discussion in merge request context documentation

See merge request gitlab-org/gitlab-ce!15885

(cherry picked from commit 8b33670e)

2cf80d11 Add docs for commit diff discussion in merge requests

Clear caches before updating MR diffs

See merge request gitlab-org/gitlab-ce!15916

Fixed doc for create MR from email

See merge request gitlab-org/gitlab-ce!15849

(cherry picked from commit 391bb437)

e297c417 Fixed doc for create MR from email

Include project in BatchLoader key to prevent returning blobs for the wrong project

Closes gitlab-ee#4325

See merge request gitlab-org/gitlab-ce!15936

(cherry picked from commit f5114187)

6c4f6d37 Include project in BatchLoader key to prevent returning blobs for the wrong project
f871027e Clear BatchLoader after each spec to prevent holding onto records longer than necessary

Clarifies documentation for user, group & project transfers

See merge request gitlab-org/gitlab-ce!15896

(cherry picked from commit af110b89)

1bdbff2d Updates doc for user, group & project transfers

Cache feature check for 1 minute for MethodCall instrumentation toggle

See merge request gitlab-org/gitlab-ce!15800

(cherry picked from commit 83998c0a)

53dc9e83 Cache feature check for 5 minutes for MethodCall instrumentation toggle
b503e6ff Implement simple in memory cache that expires after 5 minutes
6af84964 Set cache expire only once the cache is filled,
5904b033 Implemente measurement enabled cache using AtomicReference
408208bc Use AtomicFixNum to implement CAS isolated cache update.
ca176a9b move call_measurement_enabled? method to the bottom of the file
fd0a5168 use class variables instead of CONSTANTs
da19ce62 Expire feature flag cache after 1minute
51668d3e Use class variable and add rubocop exception
db9e5bf7 fix test case description

Restore throttling of touch for 10.3 stable

See merge request gitlab-org/gitlab-ce!15890