Historic review cycle time chart

It is good practice to limit the age of pull requests, but the review cycle analytics does not provide sufficient information to monitor changes over time as attempts are made to improve practices.

Proposal

• Inventory Age: age of merge requests
  • current defined as 'time between merge request creation and merge/close'
    • Is this the median age of merge requests closed/merged in last 30 days
    • Does it include currently open merge requests?
  • Proposed calculation: median age of currently open merge requests and merge requests closed today
  • Historic data: provide line chart of historic inventory age for selected time period

Links / references

https://gitlab.com/gitlab-org/gitlab-ee/issues/3716

Documentation blurb

Overview

What is it? Why should someone use this feature? What is the underlying (business) problem? How do you use this feature?

Use cases

Who is this for? Provide one or more use cases.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.

• Feature assurance
• Documentation
• Added to features.yml