When you will be doing apt update
you may encounter warnings similar to that below:
Err:4 https://repos.influxdata.com/debian bullseye InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABCDF1234ZXV098
and
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://repos.influxdata.com/debian bullseye InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABCDF1234ZXV098
W: Failed to fetch https://repos.influxdata.com/debian/dists/bullseye/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ABCDF1234ZXV098
W: Some index files failed to download. They have been ignored, or old ones used instead.
It can be fixed with steps provided by influx team Linux Package Signing Key Rotation