VictoriaMetrics/lib/httpserver/metrics.go
Aliaksandr Valialkin bc5c4add89 lib/httpserver: export vm_available_memory_bytes and vm_available_cpu_cores metrics
These metrics are useful for tracking the available memory and CPU cores for VictoriaMetrics apps.
2021-03-10 12:02:42 +02:00

71 lines
2.1 KiB
Go

package httpserver
import (
"flag"
"fmt"
"io"
"regexp"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/buildinfo"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/flagutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/memory"
"github.com/VictoriaMetrics/metrics"
)
var versionRe = regexp.MustCompile(`v\d+\.\d+\.\d+`)
// WritePrometheusMetrics writes all the registered metrics to w in Prometheus exposition format.
func WritePrometheusMetrics(w io.Writer) {
currentTime := time.Now()
metricsCacheLock.Lock()
if currentTime.Sub(metricsCacheLastUpdateTime) > time.Second {
var bb bytesutil.ByteBuffer
writePrometheusMetrics(&bb)
metricsCache.Store(&bb)
metricsCacheLastUpdateTime = currentTime
}
metricsCacheLock.Unlock()
bb := metricsCache.Load().(*bytesutil.ByteBuffer)
_, _ = w.Write(bb.B)
}
var (
metricsCacheLock sync.Mutex
metricsCacheLastUpdateTime time.Time
metricsCache atomic.Value
)
func writePrometheusMetrics(w io.Writer) {
metrics.WritePrometheus(w, true)
metrics.WriteFDMetrics(w)
fmt.Fprintf(w, "vm_app_version{version=%q, short_version=%q} 1\n", buildinfo.Version,
versionRe.FindString(buildinfo.Version))
fmt.Fprintf(w, "vm_allowed_memory_bytes %d\n", memory.Allowed())
fmt.Fprintf(w, "vm_available_memory_bytes %d\n", memory.Allowed()+memory.Remaining())
fmt.Fprintf(w, "vm_available_cpu_cores %d\n", cgroup.AvailableCPUs())
// Export start time and uptime in seconds
fmt.Fprintf(w, "vm_app_start_timestamp %d\n", startTime.Unix())
fmt.Fprintf(w, "vm_app_uptime_seconds %d\n", int(time.Since(startTime).Seconds()))
// Export flags as metrics.
flag.VisitAll(func(f *flag.Flag) {
lname := strings.ToLower(f.Name)
value := f.Value.String()
if flagutil.IsSecretFlag(lname) {
// Do not expose passwords and keys to prometheus.
value = "secret"
}
fmt.Fprintf(w, "flag{name=%q, value=%q} 1\n", f.Name, value)
})
}
var startTime = time.Now()