modules: orno_or_we_504_505_507: walk: - ORNO-MIB::orno
It looks kinda odd to me. I don't recall ever including the MIB name in the list of objects to walk. Have you tried simply:
modules: orno_or_we_504_505_507: walk: - orno(cf: https://github.com/prometheus/snmp_exporter/tree/main/generator#file-format)
OpenPGP_signature
Description: OpenPGP digital signature