mirror of
https://github.com/prometheus/node_exporter.git
synced 2025-08-20 18:33:52 -07:00
111 lines
2.4 KiB
Go
111 lines
2.4 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !noext4
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// +build !noext4
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package collector
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import (
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"fmt"
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"log/slog"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs/ext4"
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)
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// An ext4Collector is a Collector which gathers metrics from ext4 filesystems.
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type ext4Collector struct {
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fs ext4.FS
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logger *slog.Logger
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}
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func init() {
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registerCollector("ext4", defaultEnabled, NewExt4Collector)
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}
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// NewExt4Collector returns a new Collector exposing ext4 statistics.
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func NewExt4Collector(logger *slog.Logger) (Collector, error) {
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fs, err := ext4.NewFS(*procPath, *sysPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open sysfs: %w", err)
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}
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return &ext4Collector{
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fs: fs,
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logger: logger,
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}, nil
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}
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// Update implements Collector.
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func (c *ext4Collector) Update(ch chan<- prometheus.Metric) error {
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stats, err := c.fs.ProcStat()
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if err != nil {
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return fmt.Errorf("failed to retrieve ext4 stats: %w", err)
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}
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for _, s := range stats {
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c.updateExt4Stats(ch, s)
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}
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return nil
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}
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// updateExt4Stats collects statistics for a single ext4 filesystem.
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func (c *ext4Collector) updateExt4Stats(ch chan<- prometheus.Metric, s *ext4.Stats) {
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const (
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subsystem = "ext4"
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)
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var (
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labels = []string{"device"}
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)
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metrics := []struct {
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name string
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desc string
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value float64
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}{
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{
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name: "errors",
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desc: "Number of ext4 filesystem errors.",
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value: float64(s.Errors),
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},
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{
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name: "warnings",
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desc: "Number of ext4 filesystem warnings.",
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value: float64(s.Warnings),
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},
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{
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name: "messages",
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desc: "Number of ext4 filesystem log messages.",
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value: float64(s.Messages),
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},
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}
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for _, m := range metrics {
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desc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, m.name),
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m.desc,
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labels,
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nil,
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)
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ch <- prometheus.MustNewConstMetric(
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desc,
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prometheus.CounterValue,
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m.value,
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s.Name,
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)
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}
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}
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