On the dashboards under "Community" in the top navigation, for example https://wikimedia.biterg.io/app/kibana#/dashboard/Overall-Community-Structure and others, currently the only available data source is Git.
However, as Wikimedia imports quite some Git repositories from upstream which makes any Git statistics rather noisy and less useful, having Gerrit as a data source would be more relevant for us.
(For completeness: Regarding Github instead of Gerrit, please see T218529 and T218528)
Non-public internal ticket: https://gitlab.com/Bitergia/c/Wikimedia/support/issues/64