Summit challenge - health check

Idea

Summit 2018 challenge: A user can request a free instance check if a minimum users count requirement is fulfilled.

When users click Free Instance Check from the GitLab they will be redirected to a form in customers app where they confirm the data and once the form is submitted the data are sent to Salesforce. Users will get a simple report + they will then be contacted based on the data / contact they provided in the form.

Minimum users count required for the instance review is stored in application_settings. The idea is that the minimum users count can be set using customers app and GitLab will send a request every x days to update the threshold in the db. An MR for this will come later. For now we set default value 100.

What does this MR do?

It adds "Get a free instance review" button to the Core edition.

The button is displayed in the case User.count is bigger than a defined threshold and the instance does not have a valid license (=core edition). The threshold is stored in the application_setting (field instance_review_threshold) with default value of 100.

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/7345

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• EE specific content should be in the top level /ee folder
• For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?