We don’t need to include or monitor NFS file systems in the storage section of client systems. Since we only need a single alert from the NFS server, monitoring both the server and clients would generate unnecessary multiple alerts.
For AIX systems, NAMEFS and AHAFS file systems don’t require monitoring and should be excluded from the storage section.
There are probably a few ways to do this. You could adjust your alerts to do the exclusion, or you could add some exclusions in LibreNMS, or you could adjust the snmpd configuration on your clients to not export NFS mounts.
I’m not sure if the storage_type for your devices returns something that would be useful in adjusting your alerting.
Personally if you don’t want it polled I would adjust the client(s) to exclude it
https://www.net-snmp.org/docs/man/snmpd.conf.html
Have a look at skipNFSInHostResources true or storageUseNFS 2 depending on where you want to do the exclusion.
I haven’t tested this but perhaps this might point you in the right direction.