https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263262
Bug ID: 263262
Summary: prometheus_sysctl_exporter doesn't distinguish between
metric types
Product: Base System
Version: 13.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: asom...@freebsd.org
Prometheus recognizes four fundamental metric types: Counter, Gauge, Histogram,
and Summary. There are sysctls that correspond to at least three of those:
kstat.zfs.<POOL>.misc.dmu_tx_assign: histogram
kstat.zfs.dmu_tx.dmu_tx_dirty_over_max: counter
vfs.zfs.arc.max: gauge
By default Prometheus assumes that all metrics are of type Gauge unless the
exporter says otherwise. So sysctls that are really counters (like
dmu_tx_dirty_over_max) can't properly be queried in Grafana. Presumably the
histogram type can't either, but I haven't tried with any of those.
The exporter ought to publish the metric type, like this:
# HELP sysctl_foo_bar description of foo.bar
# TYPE sysctl_foo_bar counter
sysctl_foo_bar 12345
I'm not sure how to fix this. It might require adding additional information
to sysctl(3) itself.
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