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75 lines
1.9 KiB
75 lines
1.9 KiB
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !noloadavg
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package collector
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import (
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/log"
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)
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type loadavgCollector struct {
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metric prometheus.Gauge
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}
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func init() {
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Factories["loadavg"] = NewLoadavgCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// load, seconds since last login and a list of tags as specified by config.
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func NewLoadavgCollector() (Collector, error) {
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return &loadavgCollector{
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metric: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Name: "load1",
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Help: "1m load average.",
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}),
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}, nil
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}
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func (c *loadavgCollector) Update(ch chan<- prometheus.Metric) (err error) {
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load, err := getLoad1()
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if err != nil {
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return fmt.Errorf("couldn't get load: %s", err)
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}
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log.Debugf("Set node_load: %f", load)
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c.metric.Set(load)
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c.metric.Collect(ch)
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return err
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}
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func getLoad1() (float64, error) {
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data, err := ioutil.ReadFile(procFilePath("loadavg"))
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if err != nil {
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return 0, err
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}
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return parseLoad(string(data))
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}
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func parseLoad(data string) (float64, error) {
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parts := strings.Fields(data)
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load, err := strconv.ParseFloat(parts[0], 64)
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if err != nil {
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return 0, fmt.Errorf("could not parse load '%s': %s", parts[0], err)
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}
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return load, nil
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}
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