Add missing docs instruction for bg migrations

See merge request gitlab-org/gitlab!22818

Missed a line linking to the added heading, in the upgrade docs.

Add dynamic deadlines to gitaly

See merge request gitlab-org/gitlab!21492

Accept Envelope-To header

Closes #37359

See merge request gitlab-org/gitlab!22354

This makes sure that the deadline we set on a gitaly call never
exceeds the request deadline.

We also raise an exception if the request deadline has already been
exceeded by the time we're trying to make a Gitaly call.

These deadlines don't apply when calling gitaly from Sidekiq.

We do this by storing the start time of the request in the request
store on the thread (using the RequestStore).

The maximum request duration defaults to 55 seconds, as the default
worker timeout is 60 seconds. But can be configured through
gitlab.yml.

API to delete self-monitoring project and monitor status

See merge request gitlab-org/gitlab!21431

Fix typo "available"

See merge request gitlab-org/gitlab!22763

FE for share groups with groups

See merge request gitlab-org/gitlab!17139

Implement frontend support for sharing groups with groups
Unify templates for sharing projects and groups with groups

Add omnibus migrate legacy uploads out of deprecated paths command, cleanup wording

See merge request gitlab-org/gitlab!16893

Connect options helper in container expiration settings

See merge request gitlab-org/gitlab!22112

- getters file
- index changes

Use GraphQL mutation to toggle Epic subscription

Closes #34132

See merge request gitlab-org/gitlab!22872

GKE network and subnetwork dropdowns

This MR implements two dropdown fields used by the GKE cluster configuration form: network and subnetwork. This MR only contains the dropdown component implementations but it does not integrate the dropdowns in the form. The purpose is to keep the size of the MR manageable. 

To test the dropdowns, please use the following integration MR https://gitlab.com/gitlab-org/gitlab/merge_requests/22344

### Screenshots

![Screen_Shot_2020-01-09_at_2.55.28_PM](/uploads/a823f1675816d929c8bfacdc1cd5afb6/Screen_Shot_2020-01-09_at_2.55.28_PM.png)

See merge request gitlab-org/gitlab!22717

Implement dropdowns to select network and subnetworks
for a GKE cluster

Group Security Dashboard `summary` endpoint is timing out

Closes #13707

See merge request gitlab-org/gitlab!21373

Customizable commit messages for applied suggested changes

Closes #13086

See merge request gitlab-org/gitlab!21411

Replace set to let_it_be in ee/spec/features

See merge request gitlab-org/gitlab!22782

Frontend - Resolve "Display in MR if security report is outdated"

See merge request gitlab-org/gitlab!20954

When the last pipeline for the target branch hadn't detected some
security issues, maybe due to jobs failed or artifacts expired, the
MR security report should be considered outdated and the pipeline needs
to be re-run. It also handles the edge case when target branch has
received more commits and the current branch needs to be updated.

Add RECaptcha to new sign up flow

See merge request gitlab-org/gitlab!22779

Fix typo in Remove Node Modal

See merge request gitlab-org/gitlab!22494

- Add shared examples
- Add credit to community contributor

Create downstream pipeline in same project (2nd attempt)

See merge request gitlab-org/gitlab!22663

Contributes to https://gitlab.com/gitlab-org/gitlab/issues/27922

Force 2FA code input to show only numeric keyboard on touch devices

See merge request gitlab-org/gitlab!22868

Use `epicSetSubscription` mutation to update epic
subscription.

Add custom email templates for service desk

See merge request gitlab-org/gitlab!21745

* An admin API to trigger an async job that will delete the self
monitoring project.

* Also move common request specs into shared_examples.

Add icons to alerts

Closes #37317

See merge request gitlab-org/gitlab!22760

Uses `inputmode` and `pattern` attributes on 2FA input
field so that it shows numeric-only keyboard on touch
screen devices for easier code input experience.

Fix upload redirections when project has moved

Closes #196232

See merge request gitlab-org/gitlab!22822

Implement sending update frequency of build traces to runner

See merge request gitlab-org/gitlab!20841