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87 lines
2.1 KiB
87 lines
2.1 KiB
// Copyright 2016 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 !novmstat
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// +build !novmstat
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package collector
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import (
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"bufio"
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"fmt"
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"log/slog"
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"os"
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"regexp"
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"strconv"
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"strings"
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"github.com/alecthomas/kingpin/v2"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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vmStatSubsystem = "vmstat"
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)
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var (
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vmStatFields = kingpin.Flag("collector.vmstat.fields", "Regexp of fields to return for vmstat collector.").Default("^(oom_kill|pgpg|pswp|pg.*fault).*").String()
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)
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type vmStatCollector struct {
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fieldPattern *regexp.Regexp
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logger *slog.Logger
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}
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func init() {
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registerCollector("vmstat", defaultEnabled, NewvmStatCollector)
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}
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// NewvmStatCollector returns a new Collector exposing vmstat stats.
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func NewvmStatCollector(logger *slog.Logger) (Collector, error) {
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pattern := regexp.MustCompile(*vmStatFields)
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return &vmStatCollector{
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fieldPattern: pattern,
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logger: logger,
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}, nil
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}
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func (c *vmStatCollector) Update(ch chan<- prometheus.Metric) error {
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file, err := os.Open(procFilePath("vmstat"))
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if err != nil {
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return err
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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parts := strings.Fields(scanner.Text())
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value, err := strconv.ParseFloat(parts[1], 64)
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if err != nil {
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return err
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}
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if !c.fieldPattern.MatchString(parts[0]) {
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continue
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}
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ch <- prometheus.MustNewConstMetric(
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prometheus.NewDesc(
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prometheus.BuildFQName(namespace, vmStatSubsystem, parts[0]),
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fmt.Sprintf("/proc/vmstat information field %s.", parts[0]),
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nil, nil),
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prometheus.UntypedValue,
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value,
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)
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}
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return scanner.Err()
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}
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