Website graphs are not getting updated past 09/16

We still seem to have issues getting recent network data displayed on our website. E.g. take https://metrics.torproject.org/userstats-relay-country.html?start=2023-09-01&end=2023-09-26&country=all&events=off: This shows data until (and including) 09/16/2023. However, when writing this we already have 09/26/2023. While it can happen that our graphs lack 1 or 2 days, 10 days is not expected.

@hiro: I am filing this ticket for visibility issues, so other folks know we are aware of it. And we can note down what we tried and believed to be the issue and what the fix was.