WARNING API: Bad request (The API is hosted at pi.hole/api, not pi.hole/admin/api)

Hi there,
this is what I see in my FTL.log - many of them
WARNING API: Bad request (The API is hosted at pi.hole/api, not pi.hole/admin/api)
What exactly is doing on there? How to fix? Not sure if this is also connected to my Pihole Dashboard in Grafana which is curently not showing any data

Thank you

It likely is. The API was completely re-written and moved to another location. For details see Pi-hole API - Pi-hole documentation

Probably.

The old API was actually just a plain http request to /admin/api.php.

The new API uses a real REST API. Apps using Pi-hole will need to adapt to use the new API.