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Add metric for timestamp of the files file_sd is using.
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parent
384903af2e
commit
a00fc883c3
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@ -19,6 +19,7 @@ import (
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"time"
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@ -35,6 +36,54 @@ import (
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const fileSDFilepathLabel = model.MetaLabelPrefix + "filepath"
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// TimestampCollector is a Custom Collector for Timestamps of the files.
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type TimestampCollector struct {
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filenames []string
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Description *prometheus.Desc
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logger log.Logger
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}
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// Describe method sends the description to the channel.
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func (t *TimestampCollector) Describe(ch chan<- *prometheus.Desc) {
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ch <- t.Description
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}
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// SetFiles changes the filenames of the struct to the paths returned by listfiles().
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func (t *TimestampCollector) SetFiles(files []string) {
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t.filenames = files
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}
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// Collect creates constant metrics for each file with last modified time of the file.
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func (t *TimestampCollector) Collect(ch chan<- prometheus.Metric) {
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files := t.filenames
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for i := 0; i < len(files); i++ {
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info, err := os.Stat(files[i])
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if err != nil {
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t.logger.Errorf("Error getting the fileinfo of the file %q: %s", files[i], err)
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continue
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}
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ch <- prometheus.MustNewConstMetric(
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t.Description,
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prometheus.GaugeValue,
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float64(info.ModTime().Unix()),
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files[i],
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)
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}
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}
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// NewTimestampCollector creates a TimestampCollector.
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func NewTimestampCollector() *TimestampCollector {
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return &TimestampCollector{
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Description: prometheus.NewDesc(
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"prometheus_sd_file_timestamp",
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"Timestamp of files read by FileSD",
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[]string{"filename"},
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nil,
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),
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}
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}
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var (
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fileSDScanDuration = prometheus.NewSummary(
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prometheus.SummaryOpts{
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@ -46,11 +95,13 @@ var (
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Name: "prometheus_sd_file_read_errors_total",
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Help: "The number of File-SD read errors.",
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})
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fileSDTimeStamp = NewTimestampCollector()
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)
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func init() {
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prometheus.MustRegister(fileSDScanDuration)
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prometheus.MustRegister(fileSDReadErrorsCount)
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prometheus.MustRegister(fileSDTimeStamp)
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}
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// Discovery provides service discovery functionality based
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@ -195,6 +246,7 @@ func (d *Discovery) refresh(ctx context.Context, ch chan<- []*config.TargetGroup
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fileSDScanDuration.Observe(time.Since(t0).Seconds())
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}()
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fileSDTimeStamp.SetFiles(d.listFiles())
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ref := map[string]int{}
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for _, p := range d.listFiles() {
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tgroups, err := readFile(p)
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