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// 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.
//go:build !nostat
// +build !nostat
package collector
import (
"fmt"
"log/slog"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
"gopkg.in/alecthomas/kingpin.v2"
)
type statCollector struct {
fs procfs.FS
intr *prometheus.Desc
ctxt *prometheus.Desc
forks *prometheus.Desc
btime *prometheus.Desc
procsRunning *prometheus.Desc
procsBlocked *prometheus.Desc
softIRQ *prometheus.Desc
logger *slog.Logger
}
var statSoftirqFlag = kingpin.Flag("collector.stat.softirq", "Export softirq calls per vector").Default("false").Bool()
func init() {
registerCollector("stat", defaultEnabled, NewStatCollector)
}
// NewStatCollector returns a new Collector exposing kernel/system statistics.
func NewStatCollector(logger *slog.Logger) (Collector, error) {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &statCollector{
fs: fs,
intr: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "intr_total"),
"Total number of interrupts serviced.",
nil, nil,
),
ctxt: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "context_switches_total"),
"Total number of context switches.",
nil, nil,
),
forks: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "forks_total"),
"Total number of forks.",
nil, nil,
),
btime: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "boot_time_seconds"),
"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,
),
softIRQ: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "softirqs_total"),
"Number of softirq calls.",
[]string{"vector"}, nil,
),
logger: logger,
}, nil
}
// Update implements Collector and exposes kernel and system statistics.
func (c *statCollector) Update(ch chan<- prometheus.Metric) error {
stats, err := c.fs.Stat()
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))
if *statSoftirqFlag {
si := stats.SoftIRQ
for _, vec := range []struct {
name string
value uint64
}{
{name: "hi", value: si.Hi},
{name: "timer", value: si.Timer},
{name: "net_tx", value: si.NetTx},
{name: "net_rx", value: si.NetRx},
{name: "block", value: si.Block},
{name: "block_iopoll", value: si.BlockIoPoll},
{name: "tasklet", value: si.Tasklet},
{name: "sched", value: si.Sched},
{name: "hrtimer", value: si.Hrtimer},
{name: "rcu", value: si.Rcu},
} {
ch <- prometheus.MustNewConstMetric(c.softIRQ, prometheus.CounterValue, float64(vec.value), vec.name)
}
}
return nil
}
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