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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.
// +build !nostat
package collector
import (
"fmt"
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
)
type statCollector struct {
fs procfs.FS
intr *prometheus.Desc
ctxt *prometheus.Desc
forks *prometheus.Desc
btime *prometheus.Desc
procsRunning *prometheus.Desc
procsBlocked *prometheus.Desc
logger log.Logger
}
func init() {
registerCollector("stat", defaultEnabled, NewStatCollector)
}
// NewStatCollector returns a new Collector exposing kernel/system statistics.
func NewStatCollector(logger log.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,
),
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))
return nil
}
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