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Add documentation on contribution analytics

fixes #144

See merge request !103

Fix elasticsearch indexing for newly created snippets



See merge request !165

Keep track of audit event's author even when author user  was deleted

Fixes #252 

See merge request !164

Fix Jenkins service regression where category was incorrectly set to "common"

Fixes #263 

Migrate `JenkinsService` and `JenkinsDeprecatedService` so they are
correctly categorized as `ci` services again.

This prevented the deprecated service from correctly showing the build
status on merge requests.

See merge request !163

Re-introduce "Send email to users" link in Admin area

This link was mistakenly removed during a CE-to-EE merge. We've added a
view spec to ensure it doesn't happen again!

Closes gitlab-org/gitlab-ee#222

See merge request !161

This link was mistakenly removed during a CE-to-EE merge. We've added a
view spec to ensure it doesn't happen again!

Closes gitlab-org/gitlab-ee#222

Fix Mirror User dropdown

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/218

See merge request !158

Gitlab Geo: Middleware

Implements a Rails Middleware to prevent potential writing operations on the Readonly node of Gitlab Geo (https://gitlab.com/gitlab-org/gitlab-ee/issues/76).

We will redirect back to last visited page or root_url when any operation with Request type "POST PATCH PUT DELETE".

This is a special measure to friendly disallow potential dataloss or fatal errors while trying to change a readonly database

See merge request !139

Added inline comments about what `.blank_ref?` means

/cc @sytses 

See merge request !155

Move elastic modules to lib



See merge request !157

CE upstream



See merge request !156

Allow manual resize of js-autosize textareas

First, the autosize library was being too controlling and removed the
`resize` property from any elements to which it was attached, removing
the drag handle. We've disabled this behavior in the vendored library
and added a spec to prevent a regression during an upgrade.

Second, we detect (as best we can) when the user manually resizes an
autosize textarea, and then remove the autosize behavior from it and
increase its max-height.

This should allow for the best of both worlds.

Closes #12832

See merge request !2653

First, the autosize library was being too controlling and removed the
`resize` property from any elements to which it was attached, removing
the drag handle.

Second, we detect when the user manually resizes an autosize textarea,
and then remove the autosize behavior from it and increase its
max-height.

This should allow for the best of both worlds.

Closes #12832

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Optimize fetching issues closed by a merge request

Related issue: #12419

See merge request !2625

Render sanitized SVG images

Originally opened at !637 by @stanhu.

Closes https://github.com/gitlabhq/gitlabhq/issues/9265

![Screen_Shot_2016-02-01_at_17.04.01](/uploads/8e5de906698493e127dcdc475da9aaef/Screen_Shot_2016-02-01_at_17.04.01.png)


See merge request !2667

Closes https://github.com/gitlabhq/gitlabhq/issues/9265

Link to Thoughtbot review guidelines.



See merge request !2658

Instead of running ClosingIssueExtractor for every commit in a merge
request we can gather all the commit messages (and the merge request
description), concatenate all this together and then run
ClosingIssueExtractor only once.

The result of this is that MergeRequest#closes_issues is now between
3.5x and 4x faster than the old setup. Using a merge request with 10
commits (each referencing a number of issues to close) this reduced the
call duration from around 200 milliseconds to around 50 milliseconds.

As a result of these changes the Jira related tests for
MergeRequest#closes_issues have been removed. These tests stubbed
Commit#closes_issues meaning that the only code that was really tested
was the call to Array#uniq to filter out duplicate issues. As this code
is no longer used (nor present) the corresponding tests were removed.

Related: gitlab-org/gitlab-ce#12419

More advanced elastic indexer

https://gitlab.com/gitlab-com/operations/issues/56

See merge request !152

Make "Two-factor" casing consistent throughout the application

See merge request !2662

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