VSD - [FE] add "Closed issues" (FKA "Velocity") metric - total issues closed.

Release notes

"Total issues completed" metric in the Value Streams Dashboard

The Value Streams Dashboard has been enhanced with a new metric - "Total issues completed" the number of flow items completed throughout a particular point in time.

With this new metric users can identify the productivity of the Value Stream and gauges whether value delivery is accelerating or not.

How to use it? Over time, the metric accumulates historical data that teams can use to determine whether delivery rates are accelerating or if they need improving. It also help teams to helping teams to provide more accurate estimates/forecasts on how much work they can deliver.

Overview

This new metric counts only issues (not MRs as originally proposed).

Following this beta feedback.

Proposal

1. Adding new metric "Closed issues" "Velocity" to VSD comparison widget.
2. The title will show the number of issues completed completed (close) in a given time period. For example: "250 issues completed".
3. work items = issues & mrs.
4. The metric can be filtered by label.
5. Query via the GraphQL.
6. Project & Group level.
7. GitLab Ultimate
8. BE issue.
9. Adding Tooltips and Drill down.
10. BE should be consider also VSA. VSA FE is out of scope from this issue. On VSA Overview the metric will be visualize on a new tile with breakdown of total_issues and total_mrs.

Tooltips description:

Metric name	Description	Drill down for deeper insights	Go to Docs
Closed issues	Monthly number of issues closed	https://gitlab.com/gitlab-org/gitlab/-/value_stream_analytics	https://docs.gitlab.com/ee/user/analytics/value_streams_dashboard.html#dashboard-metrics-and-drill-down-reports