Most maintainers (including myself) are currently focused on fixing bugs in the upcoming bookworm release, so unless you can also demonstrate that this is an issue with prometheus-snmp-exporter 0.21.0-1, this bug is not likely to get a very prompt resolution. If the bug _is_ still present in the latest upstream version, you may have more success reporting the bug upstream, especially since it is not likely to be Debian-specific.
Can you at least include your generator.yml in this bug report?
OpenPGP_signature
Description: OpenPGP digital signature
