Updated ZFS measurements for OpenZFS 2.0

[tjnome]

Feature Request

Proposal:

With release of OpenZFS 2.0 the telegraf plugin should be updated

Current behavior:

Alot of metrics are locked on linux to old behavior of ZFS 0.7-0.8

Desired behavior:

With release of ZFS 2.0 the codebased have been unified between FreeBSD and Linux where commands and metrics should be available for both OS.

Use case:

With current behavior for linux we can't collect criticial data to ensure pool is healthy.

[sjwang90]

@tjnome If you would like to submit a PR we would gladly take a look

[aaronjwood]

Pool metrics seem to have stopped working with ZFS 2.1.x. I'd be happy to submit a PR for this + support for the new metrics but I'm very tight on time. I will see what I can do over the next few months.