The scheduler takes some time to scheduler new origins.
It's now more apparent since we added some more workers to consume the standard git queue [1].
It was a bit apparent with the gitlab.com origins (still lagging but less [2])
[1] T3825, the queue is now drained completely but the scheduler takes its time to fill it.
[2] still 409k origins lag with an apparent plateau around the 01/01/2022
https://grafana.softwareheritage.org/goto/hNSnn-Ank?orgId=1