mirror of
https://github.com/prometheus/node_exporter.git
synced 2025-08-20 18:33:52 -07:00
91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
// Copyright 2015 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 linux
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// +build linux
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package collector
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import (
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"fmt"
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"github.com/prometheus/client_golang/prometheus"
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"log/slog"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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)
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const vmSysctlPath = "/proc/sys/vm"
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type vmCollector struct {
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logger *slog.Logger
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desc *prometheus.Desc
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}
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func init() {
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registerCollector("vm_sysctl", defaultDisabled, VMSysctlCollector)
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}
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func VMSysctlCollector(logger *slog.Logger) (Collector, error) {
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return &vmCollector{
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logger: logger,
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}, nil
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}
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func (c *vmCollector) Update(ch chan<- prometheus.Metric) error {
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entries, err := os.ReadDir(vmSysctlPath)
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if err != nil {
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return fmt.Errorf("error reading %s: %w", vmSysctlPath, err)
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}
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for _, entry := range entries {
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if entry.IsDir() {
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continue // skip subdirectories
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}
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name := entry.Name()
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fullPath := filepath.Join(vmSysctlPath, name)
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data, err := os.ReadFile(fullPath)
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if err != nil {
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c.logger.Warn("failed to read vm sysctl file", "file", fullPath, "err", err)
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continue
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}
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valStr := strings.TrimSpace(string(data))
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val, err := strconv.ParseFloat(valStr, 64)
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if err != nil {
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// If file is not numeric, skip it silently
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continue
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}
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metricName := prometheus.BuildFQName("node", "vm_sysctl", sanitizeMetricName(name))
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desc := prometheus.NewDesc(metricName, fmt.Sprintf("Value of /proc/sys/vm/%s", name), nil, nil)
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ch <- prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, val)
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}
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return nil
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}
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// sanitizeMetricName replaces invalid chars with underscores (only allow a-z, 0-9, and _)
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func sanitizeMetricName(name string) string {
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name = strings.ReplaceAll(name, "-", "_")
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name = strings.ReplaceAll(name, ".", "_")
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// If needed, add more replacements here
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return name
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}
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