Add merge time metric to VSD - Median time to merge

Release notes

New efficiency metrics in the Value Streams Dashboard

The Value Streams Dashboard has been enhanced with a new metric Median time to merge. In GitLab, Median time to merge is the Median time between merge_request_created and merge_request_merged. This new metric Measure of devops health by identifying good or bad trends, and understanding the impact of changes on the speed of development and delivery process.

Overview

In Expose merge time metrics on GraphQL flowMetrics (#412711 - closed) we exposed the merge time metric via graphql. We can now add it to the VSD comparison panel.

Proposal spec for the metric:

• Name: Median time to merge
• Objective: Measure of devops health by identifying good or bad trends, and understanding the impact of changes.
• Definition: Median time between merge_request_created and merge_request_merged.
• Aggregation Type: The median time for all MRs in the group.
• Sparkline trend color- green for decrease.
• Drill-down link - Productivity Analytics - e.g. https://gitlab.com/groups/gitlab-org/-/analytics/productivity_analytics