node_exporter/collector/diskstats_linux.go

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2015-09-26 08:36:40 -07:00
// 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 !nodiskstats
// +build !nodiskstats
package collector
import (
"fmt"
"regexp"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/blockdevice"
"gopkg.in/alecthomas/kingpin.v2"
)
const (
secondsPerTick = 1.0 / 1000.0
// Read sectors and write sectors are the "standard UNIX 512-byte sectors, not any device- or filesystem-specific block size."
// See also https://www.kernel.org/doc/Documentation/block/stat.txt
unixSectorSize = 512.0
)
var (
ignoredDevices = kingpin.Flag("collector.diskstats.ignored-devices", "Regexp of devices to ignore for diskstats.").Default("^(ram|loop|fd|(h|s|v|xv)d[a-z]|nvme\\d+n\\d+p)\\d+$").String()
)
type typedFactorDesc struct {
desc *prometheus.Desc
valueType prometheus.ValueType
}
func (d *typedFactorDesc) mustNewConstMetric(value float64, labels ...string) prometheus.Metric {
return prometheus.MustNewConstMetric(d.desc, d.valueType, value, labels...)
}
type diskstatsCollector struct {
ignoredDevicesPattern *regexp.Regexp
fs blockdevice.FS
infoDesc typedFactorDesc
descs []typedFactorDesc
logger log.Logger
}
func init() {
registerCollector("diskstats", defaultEnabled, NewDiskstatsCollector)
}
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// NewDiskstatsCollector returns a new Collector exposing disk device stats.
// Docs from https://www.kernel.org/doc/Documentation/iostats.txt
func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
var diskLabelNames = []string{"device"}
fs, err := blockdevice.NewFS(*procPath, *sysPath)
if err != nil {
return nil, fmt.Errorf("failed to open sysfs: %w", err)
}
return &diskstatsCollector{
ignoredDevicesPattern: regexp.MustCompile(*ignoredDevices),
fs: fs,
infoDesc: typedFactorDesc{
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "info"),
"Info of /sys/block/<block_device>.",
[]string{"device", "major", "minor"},
nil,
), valueType: prometheus.GaugeValue,
},
descs: []typedFactorDesc{
{
desc: readsCompletedDesc, valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "reads_merged_total"),
"The total number of reads merged.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: readBytesDesc, valueType: prometheus.CounterValue,
},
{
desc: readTimeSecondsDesc, valueType: prometheus.CounterValue,
},
{
desc: writesCompletedDesc, valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "writes_merged_total"),
"The number of writes merged.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: writtenBytesDesc, valueType: prometheus.CounterValue,
},
{
desc: writeTimeSecondsDesc, valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "io_now"),
"The number of I/Os currently in progress.",
diskLabelNames,
nil,
), valueType: prometheus.GaugeValue,
},
{
desc: ioTimeSecondsDesc, valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "io_time_weighted_seconds_total"),
"The weighted # of seconds spent doing I/Os.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "discards_completed_total"),
"The total number of discards completed successfully.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "discards_merged_total"),
"The total number of discards merged.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "discarded_sectors_total"),
"The total number of sectors discarded successfully.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "discard_time_seconds_total"),
"This is the total number of seconds spent by all discards.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "flush_requests_total"),
"The total number of flush requests completed successfully",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
{
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, diskSubsystem, "flush_requests_time_seconds_total"),
"This is the total number of seconds spent by all flush requests.",
diskLabelNames,
nil,
), valueType: prometheus.CounterValue,
},
},
logger: logger,
}, nil
}
func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
diskStats, err := c.fs.ProcDiskstats()
if err != nil {
return fmt.Errorf("couldn't get diskstats: %w", err)
}
for _, stats := range diskStats {
dev := stats.DeviceName
if c.ignoredDevicesPattern.MatchString(dev) {
level.Debug(c.logger).Log("msg", "Ignoring device", "device", dev, "pattern", c.ignoredDevicesPattern)
continue
}
ch <- c.infoDesc.mustNewConstMetric(1.0, dev, fmt.Sprint(stats.MajorNumber), fmt.Sprint(stats.MinorNumber))
statCount := stats.IoStatsCount - 3 // Total diskstats record count, less MajorNumber, MinorNumber and DeviceName
for i, val := range []float64{
float64(stats.ReadIOs),
float64(stats.ReadMerges),
float64(stats.ReadSectors) * unixSectorSize,
float64(stats.ReadTicks) * secondsPerTick,
float64(stats.WriteIOs),
float64(stats.WriteMerges),
float64(stats.WriteSectors) * unixSectorSize,
float64(stats.WriteTicks) * secondsPerTick,
float64(stats.IOsInProgress),
float64(stats.IOsTotalTicks) * secondsPerTick,
float64(stats.WeightedIOTicks) * secondsPerTick,
float64(stats.DiscardIOs),
float64(stats.DiscardMerges),
float64(stats.DiscardSectors),
float64(stats.DiscardTicks) * secondsPerTick,
float64(stats.FlushRequestsCompleted),
float64(stats.TimeSpentFlushing) * secondsPerTick,
} {
if i >= statCount {
break
}
ch <- c.descs[i].mustNewConstMetric(val, dev)
}
}
return nil
}