8ff2b52241
Add two options, -i and -e, for filtering prometheus metrics. Each option takes a regular expression as an argument. The provided regex will be tested against the prometheus metric name. The -i option includes metrics matching the given regex. The -e option excludes metrics matching the given regex. Sponsored by: Modirum MDPay Sponsored by: Klara Inc. Reviewed by: 0mp, debdrup Differential Revision: https://reviews.freebsd.org/D32269
123 lines
4.0 KiB
Groff
123 lines
4.0 KiB
Groff
.\" Copyright (c) 2016 Nuxi, https://nuxi.nl/
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd October 7, 2021
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.Dt PROMETHEUS_SYSCTL_EXPORTER 8
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.Os
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.Sh NAME
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.Nm prometheus_sysctl_exporter
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.Nd print kernel state as Prometheus metrics
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.Sh SYNOPSIS
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.Nm prometheus_sysctl_exporter
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.Op Fl dgh
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.Op Fl e Ar pattern
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.Op Fl i Ar pattern
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.Op Ar prefix ...
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.Sh DESCRIPTION
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Prometheus is a monitoring system that gathers metrics from its targets
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by fetching them through HTTP GET requests.
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Metrics are identified by a name and an optional set of labels.
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Sample values are required to be numerical.
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.Pp
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The
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.Nm
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utility prints the values of sysctl nodes to standard output,
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formatted such that they can be scraped by Prometheus directly.
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By default,
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it prints metrics for all numerically representable nodes in the sysctl
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namespace.
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It is also possible to limit output to a smaller number of metrics by
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specifying one or more prefixes as arguments.
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.Pp
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Metrics printed by this utility are named
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.Ql sysctl_ ,
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followed by the name of the sysctl node having its
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.Ql .\&
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separators replaced by
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.Ql _ .
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Components on which it is desirable to aggregate (e.g.,
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names of devices) are omitted from the metric's name,
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but are appended as labels instead.
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.Pp
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There are two different methods for exporting the output of
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.Nm
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to Prometheus.
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The first method is to periodically invoke this utility through
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.Xr cron 8
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and store its output in a textfile.
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The metrics in this textfile can then be served over HTTP using the
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Prometheus node exporter's textfile collector.
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The second method is to run this utility through
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.Xr inetd 8 .
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TCP port 9124 has been allocated for this purpose.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl d
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Print descriptions of metrics when available.
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.It Fl e Ar pattern
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Same as
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.Fl i ,
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except exclude metrics that match
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.Ar pattern .
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.It Fl g
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Gzip compresses the HTTP response body.
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.It Fl h
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Precede the output with a HTTP response header.
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This flag is required when running this utility through
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.Xr inetd 8 .
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.It Fl i Ar pattern
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If specified, include metrics that match
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.Ar pattern .
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The format of
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.Ar pattern
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is to be a regular expression as described in
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.Xr re_format 7 .
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The provided regular expression is tested against the Prometheus
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metric name.
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.El
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.Sh SEE ALSO
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.Xr cron 8 ,
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.Xr inetd 8 ,
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.Xr sysctl 8 ,
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.Xr SYSCTL_ADD_NODE_WITH_LABEL 9
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.Pp
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Prometheus project:
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.Pa https://prometheus.io/ .
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.Pp
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Prometheus exposition formats:
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.Pa https://prometheus.io/docs/instrumenting/exposition_formats/ .
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.Pp
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Prometheus node exporter:
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.Pa https://github.com/prometheus/node_exporter .
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.Pp
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Prometheus default port allocations:
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.Pa https://github.com/prometheus/prometheus/wiki/Default-port-allocations .
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.Sh HISTORY
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.Nm
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first appeared in
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.Fx 12.0 .
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.Sh AUTHORS
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.An Nuxi : Pa https://nuxi.nl/ .
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