node_exporter/collector/stat_linux.go
Calle Pettersson 859a825bb8 Replace --collectors.enabled with per-collector flags (#640)
* Move NodeCollector into package collector

* Refactor collector enabling

* Update README with new collector enabled flags

* Fix out-of-date inline flag reference syntax

* Use new flags in end-to-end tests

* Add flag to disable all default collectors

* Track if a flag has been set explicitly

* Add --collectors.disable-defaults to README

* Revert disable-defaults flag

* Shorten flags

* Fixup timex collector registration

* Fix end-to-end tests

* Change procfs and sysfs path flags

* Fix review comments
2017-09-28 15:06:26 +02:00

103 lines
3.1 KiB
Go

// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !nostat
package collector
import (
"fmt"
"github.com/prometheus/procfs"
"github.com/prometheus/client_golang/prometheus"
)
type statCollector struct {
cpu *prometheus.Desc
intr *prometheus.Desc
ctxt *prometheus.Desc
forks *prometheus.Desc
btime *prometheus.Desc
procsRunning *prometheus.Desc
procsBlocked *prometheus.Desc
}
func init() {
registerCollector("stat", defaultEnabled, NewStatCollector)
}
// NewStatCollector returns a new Collector exposing kernel/system statistics.
func NewStatCollector() (Collector, error) {
return &statCollector{
cpu: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "cpu"),
"Seconds the cpus spent in each mode.",
[]string{"cpu", "mode"}, nil,
),
intr: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "intr"),
"Total number of interrupts serviced.",
nil, nil,
),
ctxt: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "context_switches"),
"Total number of context switches.",
nil, nil,
),
forks: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "forks"),
"Total number of forks.",
nil, nil,
),
btime: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "boot_time"),
"Node boot time, in unixtime.",
nil, nil,
),
procsRunning: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "procs_running"),
"Number of processes in runnable state.",
nil, nil,
),
procsBlocked: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "procs_blocked"),
"Number of processes blocked waiting for I/O to complete.",
nil, nil,
),
}, nil
}
// Update implements Collector and exposes kernel and system statistics.
func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return fmt.Errorf("failed to open procfs: %v", err)
}
stats, err := fs.NewStat()
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(c.intr, prometheus.CounterValue, float64(stats.IRQTotal))
ch <- prometheus.MustNewConstMetric(c.ctxt, prometheus.CounterValue, float64(stats.ContextSwitches))
ch <- prometheus.MustNewConstMetric(c.forks, prometheus.CounterValue, float64(stats.ProcessCreated))
ch <- prometheus.MustNewConstMetric(c.btime, prometheus.GaugeValue, float64(stats.BootTime))
ch <- prometheus.MustNewConstMetric(c.procsRunning, prometheus.GaugeValue, float64(stats.ProcessesRunning))
ch <- prometheus.MustNewConstMetric(c.procsBlocked, prometheus.GaugeValue, float64(stats.ProcessesBlocked))
return nil
}