Prometheus

Date: 2026-02-11
Host: FreeBSD jail host
Component: RACCT/RCTL + node_exporter textfile collector
Outcome: Per-jail RAM/VMEM/SWAP metrics in Prometheus/Grafana

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Making ZFS ARC Grafana Panels FreeBSD-Compatible

Steps taken to make an imported ZFS/Grafana dashboard work correctly on FreeBSD. Panels assumed Linux exporters and referenced metrics that do not exist on FreeBSD. The result was a dashboard full of empty panels. This walkthrough shows how the missing ARC kstats where identified, cleanly exported and refactored so that the panels reflect the real FreeBSD kernel state.

Host: clemente (10.10.0.1)
Stack: FreeBSD + node_exporter (textfile collector) + Prometheus + Grafana
Date: 2026-02-10

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Overview (Context & Goal)

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Date: 2026-02-08
Host: grafana
Component: Prometheus + Grafana + exporters +zfs
Scope: ZFS monitoring

ZFS / Zpool Metrics for Prometheus (node_exporter + textfile collector on FreeBSD)

This guide sets up zpool capacity metrics (zpool list) for Prometheus/Grafana using node_exporter’s textfile collector on FreeBSD.

This complements (not replaces) zfs_exporter, which provides ARC/internal ZFS metrics but not pool capacity.

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What I Got Working

Metrics exposed to Prometheus:

• zpool_size_bytes{pool="zroot"}
• zpool_alloc_bytes{pool="zroot"}
• zpool_free_bytes{pool="zroot"}
• zpool_capacity_ratio{pool="zroot"}

These map directly to:

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Date: 2026-02-08
Host: grafana
Component: Prometheus + Grafana + exporters
Scope: DNS monitoring

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