NAS-130194 / 24.10 / Add additional ARC stats for UI

[Qubad786]

Problem

The UI requires new files that are currently missing in the realtime.reporting event.

Solution

The necessary fields have been added to the realtime.reporting event. The UI can now retrieve the relevant information from the following keys in ZFS ARC reporting:

• Current size: arc_size
• Maximum size: arc_max_size
• Demand data hits: arc_demand_data_hits
• Demand metadata hits: arc_demand_metadata_hits
• Prefetch data hits: arc_prefetch_data_hits
• Prefetch metadata hits: arc_prefetch_metadata_hits

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Reference

https://learn.netdata.cloud/docs/collecting-metrics/freebsd/zfs
https://github.com/netdata/netdata/blob/master/src/collectors/proc.plugin/zfs_common.c#L19C24-L19C28

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-130194

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-130194

[yocalebo]

It's unfortunate but I've been working on this ticket all day. Netdata doesn't calculate the values properly. We need to go back to doing this ourselves unfortunately.