Use inspect to see the command, that Icinga is calling and then see if you can reproduce the problem, by manually calling the plugin on the cli.
If you can reproduce it, it’s the command or the plugin. If it’s the command, maybe the there’s a difference in how the old and the new Icinga version constructs the command.
Sorry to be blunt, but that config makes no sense^^.
It is named “all drives”, but snmp_storage_type is set to Ram, suggesting RAM/memory is to be checked.
It is assigned to windows systems, yet you define snmp_storage_name = "\\\\" (which makes no sense in itself) similar to linux systems.
I think it would be best if you describe what (and where) you want to check something and (as @lorenz said) what cli command worked for you.