node_exporter/collector/loadavg.go

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// +build !noloadavg
package collector
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/log"
)
const (
procLoad = "/proc/loadavg"
)
type loadavgCollector struct {
metric prometheus.Gauge
}
func init() {
Factories["loadavg"] = NewLoadavgCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// load, seconds since last login and a list of tags as specified by config.
func NewLoadavgCollector() (Collector, error) {
return &loadavgCollector{
metric: prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: Namespace,
Name: "load1",
Help: "1m load average.",
}),
}, nil
}
func (c *loadavgCollector) Update(ch chan<- prometheus.Metric) (err error) {
load, err := getLoad1()
if err != nil {
return fmt.Errorf("Couldn't get load: %s", err)
}
log.Debugf("Set node_load: %f", load)
c.metric.Set(load)
c.metric.Collect(ch)
return err
}
func getLoad1() (float64, error) {
data, err := ioutil.ReadFile(procLoad)
if err != nil {
return 0, err
}
return parseLoad(string(data))
}
func parseLoad(data string) (float64, error) {
parts := strings.Fields(data)
load, err := strconv.ParseFloat(parts[0], 64)
if err != nil {
return 0, fmt.Errorf("Could not parse load '%s': %s", parts[0], err)
}
return load, nil
}