mirror of
https://github.com/prometheus/node_exporter.git
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b1298677aa
Minor change to match naming convention in other collectors. Initialize the proc or sys FS instance once while initializing each collector instead of re-creating for each metric update. Signed-off-by: Paul Gier <pgier@redhat.com>
99 lines
3.0 KiB
Go
99 lines
3.0 KiB
Go
// 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 !nostat
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package collector
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import (
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"fmt"
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"github.com/prometheus/procfs"
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"github.com/prometheus/client_golang/prometheus"
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)
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type statCollector struct {
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fs procfs.FS
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intr *prometheus.Desc
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ctxt *prometheus.Desc
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forks *prometheus.Desc
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btime *prometheus.Desc
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procsRunning *prometheus.Desc
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procsBlocked *prometheus.Desc
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}
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func init() {
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registerCollector("stat", defaultEnabled, NewStatCollector)
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}
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// NewStatCollector returns a new Collector exposing kernel/system statistics.
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func NewStatCollector() (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: %v", err)
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}
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return &statCollector{
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fs: fs,
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intr: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "intr_total"),
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"Total number of interrupts serviced.",
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nil, nil,
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),
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ctxt: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "context_switches_total"),
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"Total number of context switches.",
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nil, nil,
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),
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forks: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "forks_total"),
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"Total number of forks.",
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nil, nil,
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),
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btime: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "boot_time_seconds"),
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"Node boot time, in unixtime.",
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nil, nil,
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),
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procsRunning: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "procs_running"),
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"Number of processes in runnable state.",
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nil, nil,
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),
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procsBlocked: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "procs_blocked"),
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"Number of processes blocked waiting for I/O to complete.",
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nil, nil,
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),
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}, nil
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}
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// Update implements Collector and exposes kernel and system statistics.
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func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
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stats, err := c.fs.NewStat()
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if err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(c.intr, prometheus.CounterValue, float64(stats.IRQTotal))
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ch <- prometheus.MustNewConstMetric(c.ctxt, prometheus.CounterValue, float64(stats.ContextSwitches))
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ch <- prometheus.MustNewConstMetric(c.forks, prometheus.CounterValue, float64(stats.ProcessCreated))
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ch <- prometheus.MustNewConstMetric(c.btime, prometheus.GaugeValue, float64(stats.BootTime))
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ch <- prometheus.MustNewConstMetric(c.procsRunning, prometheus.GaugeValue, float64(stats.ProcessesRunning))
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ch <- prometheus.MustNewConstMetric(c.procsBlocked, prometheus.GaugeValue, float64(stats.ProcessesBlocked))
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return nil
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}
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