// +build !noloadavg package collector import ( "fmt" "io/ioutil" "strconv" "strings" "github.com/golang/glog" "github.com/prometheus/client_golang/prometheus" ) const ( procLoad = "/proc/loadavg" ) var ( load1 = prometheus.NewGauge(prometheus.GaugeOpts{ Namespace: Namespace, Name: "load1", Help: "1m load average.", }) ) type loadavgCollector struct { config Config } func init() { Factories["loadavg"] = NewLoadavgCollector } // Takes a config struct and prometheus registry and returns a new Collector exposing // load, seconds since last login and a list of tags as specified by config. func NewLoadavgCollector(config Config) (Collector, error) { c := loadavgCollector{ config: config, } return &c, 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) } glog.V(1).Infof("Set node_load: %f", load) load1.Set(load) load1.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 }