## Problem This is the backend implementation issue for https://gitlab.com/gitlab-org/gitlab/-/issues/229389. ## Proposal The GraphQL API should return the "mean time to merge" (the average amount of time between MR opened and MR merged) for a given time period and given filters. In the case of this MTTM container the [default time period is 12 months](https://gitlab.com/gitlab-org/gitlab/-/issues/246820#note_413765366).