mirror of
https://github.com/prometheus/node_exporter.git
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e49a13d0cf
Suppres error log noise if schedstat file doesn't exist. Signed-off-by: Ben Kochie <superq@gmail.com>
105 lines
2.6 KiB
Go
105 lines
2.6 KiB
Go
// Copyright 2019 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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package collector
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import (
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"fmt"
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"os"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/procfs"
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)
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const nsPerSec = 1e9
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var (
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runningSecondsTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "schedstat", "running_seconds_total"),
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"Number of seconds CPU spent running a process.",
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[]string{"cpu"},
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nil,
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)
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waitingSecondsTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "schedstat", "waiting_seconds_total"),
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"Number of seconds spent by processing waiting for this CPU.",
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[]string{"cpu"},
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nil,
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)
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timeslicesTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "schedstat", "timeslices_total"),
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"Number of timeslices executed by CPU.",
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[]string{"cpu"},
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nil,
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)
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)
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// NewSchedstatCollector returns a new Collector exposing task scheduler statistics
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func NewSchedstatCollector(logger log.Logger) (Collector, error) {
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fs, err := procfs.NewFS(*procPath)
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if err != nil {
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return nil, fmt.Errorf("failed to open procfs: %w", err)
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}
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return &schedstatCollector{fs, logger}, nil
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}
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type schedstatCollector struct {
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fs procfs.FS
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logger log.Logger
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}
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func init() {
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registerCollector("schedstat", defaultEnabled, NewSchedstatCollector)
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}
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func (c *schedstatCollector) Update(ch chan<- prometheus.Metric) error {
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stats, err := c.fs.Schedstat()
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if err != nil {
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if os.IsNotExist(err) {
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level.Debug(c.logger).Log("msg", "schedstat file does not exist")
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return ErrNoData
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}
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return err
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}
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for _, cpu := range stats.CPUs {
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ch <- prometheus.MustNewConstMetric(
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runningSecondsTotal,
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prometheus.CounterValue,
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float64(cpu.RunningNanoseconds)/nsPerSec,
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cpu.CPUNum,
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)
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ch <- prometheus.MustNewConstMetric(
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waitingSecondsTotal,
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prometheus.CounterValue,
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float64(cpu.WaitingNanoseconds)/nsPerSec,
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cpu.CPUNum,
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)
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ch <- prometheus.MustNewConstMetric(
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timeslicesTotal,
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prometheus.CounterValue,
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float64(cpu.RunTimeslices),
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cpu.CPUNum,
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)
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}
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return nil
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}
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