mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-21 16:06:31 +01:00
81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
package httpserver
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import (
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"flag"
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"fmt"
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"io"
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"regexp"
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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 versionRe = regexp.MustCompile(`v\d+\.\d+\.\d+`)
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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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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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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().(*bytesutil.ByteBuffer)
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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.Value
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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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fmt.Fprintf(w, "vm_app_version{version=%q, short_version=%q} 1\n", buildinfo.Version,
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versionRe.FindString(buildinfo.Version))
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fmt.Fprintf(w, "vm_allowed_memory_bytes %d\n", memory.Allowed())
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fmt.Fprintf(w, "vm_available_memory_bytes %d\n", memory.Allowed()+memory.Remaining())
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fmt.Fprintf(w, "vm_available_cpu_cores %d\n", cgroup.AvailableCPUs())
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fmt.Fprintf(w, "vm_gogc %d\n", cgroup.GetGOGC())
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// Export start time and uptime in seconds
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fmt.Fprintf(w, "vm_app_start_timestamp %d\n", startTime.Unix())
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fmt.Fprintf(w, "vm_app_uptime_seconds %d\n", int(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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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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