- instead of using properties
- backward compatibility has to be kept for now

Relates to #42595.
Fixes #62661.

Update external issue tracker services test, remove `prop_accessor :title` from YouTrack integration service

Fixes gitlab-org/gitlab-ce#42595

Partially addresses #47424.

Code improvements, bug fixes, finish documentation and specs

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

In 8278b763 the default behaviour of annotation
has changes, which was causing a lot of noise in diffs. We decided in #17382
that it is better to get rid of the whole annotate gem, and instead let people
look at schema.rb for the columns in a table.

Fixes: #17382

Supports four different event types all bundled under the "note" event type:

- comments on a commit
- comments on an issue
- comments on a merge request
- comments on a code snippet

Stan Hu authored 10 years ago and Douwe Maan committed 10 years ago

1) Adds a DB migration for all services to toggle on push, issue, and merge events.

2) Upon an issue or merge request event, fire service hooks.

3) Slack service supports custom messages for each of these events. Other services
not supported at the moment.

4) Label merge request hooks with their corresponding actions.