## Problem Mean time to merge (MTTM) will be a metric our users will want to actively track and manage. ## Proposal  * For the time period and filtered criteria, show the mean time to merge (the average amount of time between MR opened and MR merged). Note: This is the ~frontend implementation issue. The ~backend issue is here: #246820. Note 2: On the screenshot we see the possibility to choose the time period, but that is not yet implemented, the [default time is past 12 months](https://gitlab.com/gitlab-org/gitlab/-/issues/246820#note_413765366).