mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2026-05-17 08:36:55 +03:00
0a31eacb3d
Follow-up commit for
211fb08028
Address @f41gh7 review comments:
- Move code from `lib/osinfo` to `lib/appmetrics`.
- Make the logic private.
- Use metrics.WriteGaugeUint64 func.
- Remove registration logic from `app/xxx/main.go`.
- Remove `lib/osinfo` package.
91 lines
3.0 KiB
Go
91 lines
3.0 KiB
Go
package appmetrics
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import (
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"flag"
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"fmt"
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"io"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
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"github.com/VictoriaMetrics/metrics"
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)
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var exposeMetadata = flag.Bool("metrics.exposeMetadata", false, "Whether to expose TYPE and HELP metadata at the /metrics page, which is exposed at -httpListenAddr . "+
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"The metadata may be needed when the /metrics page is consumed by systems, which require this information. For example, Managed Prometheus in Google Cloud - "+
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"https://cloud.google.com/stackdriver/docs/managed-prometheus/troubleshooting#missing-metric-type")
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var exposeMetadataOnce sync.Once
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func initExposeMetadata() {
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metrics.ExposeMetadata(*exposeMetadata)
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}
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// WritePrometheusMetrics writes all the registered metrics to w in Prometheus exposition format.
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func WritePrometheusMetrics(w io.Writer) {
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exposeMetadataOnce.Do(initExposeMetadata)
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currentTime := time.Now()
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metricsCacheLock.Lock()
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if currentTime.Sub(metricsCacheLastUpdateTime) > time.Second {
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var bb bytesutil.ByteBuffer
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writePrometheusMetrics(&bb)
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writeOSMetrics(&bb)
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metricsCache.Store(&bb)
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metricsCacheLastUpdateTime = currentTime
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}
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metricsCacheLock.Unlock()
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bb := metricsCache.Load()
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_, _ = w.Write(bb.B)
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}
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var (
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metricsCacheLock sync.Mutex
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metricsCacheLastUpdateTime time.Time
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metricsCache atomic.Pointer[bytesutil.ByteBuffer]
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)
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func writePrometheusMetrics(w io.Writer) {
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metrics.WritePrometheus(w, true)
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metrics.WriteFDMetrics(w)
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metrics.WriteGaugeUint64(w, fmt.Sprintf("vm_app_version{version=%q, short_version=%q}", buildinfo.Version, buildinfo.ShortVersion()), 1)
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metrics.WriteGaugeUint64(w, "vm_allowed_memory_bytes", uint64(memory.Allowed()))
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metrics.WriteGaugeUint64(w, "vm_available_memory_bytes", uint64(memory.Allowed()+memory.Remaining()))
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metrics.WriteGaugeUint64(w, "vm_available_cpu_cores", uint64(cgroup.AvailableCPUs()))
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metrics.WriteGaugeUint64(w, "vm_gogc", uint64(cgroup.GetGOGC()))
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// Export start time and uptime in seconds
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metrics.WriteGaugeUint64(w, "vm_app_start_timestamp", uint64(startTime.Unix()))
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metrics.WriteGaugeUint64(w, "vm_app_uptime_seconds", uint64(time.Since(startTime).Seconds()))
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// Export flags as metrics.
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isSetMap := make(map[string]bool)
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flag.Visit(func(f *flag.Flag) {
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isSetMap[f.Name] = true
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})
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metrics.WriteMetadataIfNeeded(w, "flag", "gauge")
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flag.VisitAll(func(f *flag.Flag) {
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lname := strings.ToLower(f.Name)
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value := f.Value.String()
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if flagutil.IsSecretFlag(lname) {
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// Do not expose passwords and keys to prometheus.
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value = "secret"
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}
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isSet := "false"
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if isSetMap[f.Name] {
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isSet = "true"
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}
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fmt.Fprintf(w, "flag{name=%q, value=%q, is_set=%q} 1\n", f.Name, value, isSet)
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})
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}
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var startTime = time.Now()
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