Add `Global Milestones` so that they can be assigned to projects when you create them

Moved from: https://dev.gitlab.org/gitlab/gitlabhq/issues/2474

Create a new milestone from the milestones view and choose which projects should be assigned this milestone.

Right now, if you want to have the same milestone across projects, so that it shows nicely grouped in the milestones view, you need to create them manually for each project. This can be annoying if you have to do it for more than 3 projects.

mentioned in merge request !1797 (merged)

I started with a group as a most common place for projects to share milestone. Example: we create from 3-5 milestones each release in GitLab.org group.

mentioned in commit 0061143c

Creating milestone in group was implemented in 8.2. According to dev issue we decided on Group milestones. Not sure if we need one for Dashboard. Most likely you are not going to bulk create same milestone for projects in different groups. I would rather stop with current functionality and see if someone actually need Dashboard milestones creating form or not. cc @JobV @sytses

@patricio can you report back the current functionality to the requestor in https://dev.gitlab.org/gitlab/gitlabhq/issues/2474 ? Mention the we assume that group milestones are good enough. But if they are using 8.2 or later and still have trouble we'll be glad to look into it again.

Status changed to closed

Reopen until reported back.

Status changed to reopened

Reassigned to @patricio

Status changed to closed

Thanks @sytses I reported back. I will reopen the issue if the customer would like to revisit.

I know this is closed, but a "global" milestone isn't really global if its only available in one group, isn't it?
We use GitLab to store code of many different platforms (web/iOS/android/c++/...) and we have groups for our developers on each platform. But that projects are just the platform depending version of the same app, so they share milestones for features and issues. It would be very convenient if we could create rally "global" milestones which can hold also cross group projects.

+1 for global milestones that cover cross group projects

We expecting the same difficulties as @p0fi

Same need here. +1 for milestones across groups

mentioned in issue #1802 (closed)

How can I add projects to existing milestones? The milestone was created a while ago directly in a project, not the group. Is this possible? I can't figure out how to do this from the UI. It only seems possible with new milestones.

Edit: I created a separate issue for this over at #18184 (moved) .

mentioned in issue #18184 (moved)

Any chance to configure GitLab to not group milestones? Grouping milestones just because they share the same name might be not the best assumption. Ideally I would love to decide on own which milestones should be grouped and which milestones should not be grouped.

mentioned in issue #26408 (moved)

I have a Group with 3 projects in it. I can create a milestone for each project, but can I create one for the entire Group so that it could be used in all projects in that group?

mentioned in issue #30126 (closed)

mentioned in issue gitlab#5040

mentioned in issue gitlab#7678

mentioned in merge request !14785