RFE: Support all Linux kernel NFSv4 client and server RPC operations #699
Description
Currently, procfs has incomplete support for NFSv4 RPC operation statistics for both NFS clients and NFS servers. The NFS server metrics are missing all NFS v4.1, v4.2, and RFC 8276 xattr operations. The NFS v4 client operations are more complicated (because the Linux kernel is more complicated here), but I believe it's missing nine operations (it has up to 'Copy' and is missing from 'Copy' onward).
One additional effect of the current state is that the Linux client metrics include operations that the NFS server metrics don't, which can be confusing if you have an all-Linux NFS environment and you're trying to watch both clients and servers.