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Update node_disk_info with additional labels #2216

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59 changes: 57 additions & 2 deletions collector/diskstats_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,10 @@ package collector

import (
"fmt"
"os"
"path/filepath"
"regexp"
"strings"

"github.com/go-kit/log"
"github.com/go-kit/log/level"
Expand Down Expand Up @@ -48,6 +51,7 @@ type diskstatsCollector struct {
ignoredDevicesPattern *regexp.Regexp
fs blockdevice.FS
infoDesc typedFactorDesc
underlyingDesc typedFactorDesc
descs []typedFactorDesc
logger log.Logger
}
Expand All @@ -71,7 +75,14 @@ func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
infoDesc: typedFactorDesc{
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "info"),
"Info of /sys/block/<block_device>.",
[]string{"device", "major", "minor"},
[]string{"device", "major", "minor", "name", "dm_uuid", "uuid", "path"},
nil,
), valueType: prometheus.GaugeValue,
},
underlyingDesc: typedFactorDesc{
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "underlying_info"),
"Underlying devicemapper device.",
[]string{"device", "under"},
nil,
), valueType: prometheus.GaugeValue,
},
Expand Down Expand Up @@ -182,19 +193,62 @@ func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
}, nil
}

func (c *diskstatsCollector) readDevLinks(path string) map[string]string {
mapping := make(map[string]string)

byPathDir, err := os.Open(path)
if err != nil {
level.Debug(c.logger).Log("msg", "Error opening directory", "path", path, "err", err)
} else {
defer byPathDir.Close()

byPathNames, err := byPathDir.Readdirnames(-1)
if err != nil {
level.Debug(c.logger).Log("msg", "Error reading directory", "path", path, "err", err)
} else {
for _, byPathName := range byPathNames {
path := filepath.Join(path, byPathName)
dest, err := filepath.EvalSymlinks(path)
if err != nil {
level.Debug(c.logger).Log("msg", "Error reading symlink", "path", path, "err", err)
} else {
mapping[strings.Replace(dest, "/dev/", "", 1)] = byPathName
}
}
}
}
return mapping
}

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)
}

var diskByPath map[string]string = c.readDevLinks("/dev/disk/by-path")
var diskByUUID map[string]string = c.readDevLinks("/dev/disk/by-uuid")

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
}

dmSlave, err := c.fs.SysBlockDeviceUnderlyingDevices(dev)
if err != nil {
level.Debug(c.logger).Log("msg", "Error getting devicemapper slave devices", "device", dev, "err", err)
}
for _, subdev := range dmSlave.DeviceNames {
ch <- c.underlyingDesc.mustNewConstMetric(1.0, dev, subdev)
}

dmInfo, err := c.fs.SysBlockDeviceMapperInfo(dev)
if err != nil {
level.Debug(c.logger).Log("msg", "Error getting devicemapper info", "device", dev, "err", err)
}

diskSectorSize := 512.0
blockQueue, err := c.fs.SysBlockDeviceQueueStats(dev)
if err != nil {
Expand All @@ -203,7 +257,8 @@ func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
diskSectorSize = float64(blockQueue.LogicalBlockSize)
}

ch <- c.infoDesc.mustNewConstMetric(1.0, dev, fmt.Sprint(stats.MajorNumber), fmt.Sprint(stats.MinorNumber))
ch <- c.infoDesc.mustNewConstMetric(1.0, dev, fmt.Sprint(stats.MajorNumber), fmt.Sprint(stats.MinorNumber),
dmInfo.Name, dmInfo.UUID, diskByUUID[dev], diskByPath[dev])

statCount := stats.IoStatsCount - 3 // Total diskstats record count, less MajorNumber, MinorNumber and DeviceName

Expand Down
30 changes: 15 additions & 15 deletions collector/diskstats_linux_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -74,21 +74,21 @@ node_disk_flush_requests_time_seconds_total{device="sdc"} 1.944
node_disk_flush_requests_total{device="sdc"} 1555
# HELP node_disk_info Info of /sys/block/<block_device>.
# TYPE node_disk_info gauge
node_disk_info{device="dm-0",major="252",minor="0"} 1
node_disk_info{device="dm-1",major="252",minor="1"} 1
node_disk_info{device="dm-2",major="252",minor="2"} 1
node_disk_info{device="dm-3",major="252",minor="3"} 1
node_disk_info{device="dm-4",major="252",minor="4"} 1
node_disk_info{device="dm-5",major="252",minor="5"} 1
node_disk_info{device="mmcblk0",major="179",minor="0"} 1
node_disk_info{device="mmcblk0p1",major="179",minor="1"} 1
node_disk_info{device="mmcblk0p2",major="179",minor="2"} 1
node_disk_info{device="nvme0n1",major="259",minor="0"} 1
node_disk_info{device="sda",major="8",minor="0"} 1
node_disk_info{device="sdb",major="8",minor="0"} 1
node_disk_info{device="sdc",major="8",minor="0"} 1
node_disk_info{device="sr0",major="11",minor="0"} 1
node_disk_info{device="vda",major="254",minor="0"} 1
node_disk_info{device="dm-0",dm_uuid="",major="252",minor="0",name="",path="",uuid="53cac259-4cf9-416e-84e7-4eb55273c7cb"} 1
node_disk_info{device="dm-1",dm_uuid="",major="252",minor="1",name="",path="",uuid="20bfb821-c6d7-4d98-bbdb-f6d9216afbda"} 1
node_disk_info{device="dm-2",dm_uuid="",major="252",minor="2",name="",path="",uuid=""} 1
node_disk_info{device="dm-3",dm_uuid="",major="252",minor="3",name="",path="",uuid=""} 1
node_disk_info{device="dm-4",dm_uuid="",major="252",minor="4",name="",path="",uuid=""} 1
node_disk_info{device="dm-5",dm_uuid="",major="252",minor="5",name="",path="",uuid=""} 1
node_disk_info{device="mmcblk0",dm_uuid="",major="179",minor="0",name="",path="",uuid=""} 1
node_disk_info{device="mmcblk0p1",dm_uuid="",major="179",minor="1",name="",path="",uuid=""} 1
node_disk_info{device="mmcblk0p2",dm_uuid="",major="179",minor="2",name="",path="",uuid=""} 1
node_disk_info{device="nvme0n1",dm_uuid="",major="259",minor="0",name="",path="pci-0000:3c:00.0-nvme-1",uuid=""} 1
node_disk_info{device="sda",dm_uuid="",major="8",minor="0",name="",path="",uuid=""} 1
node_disk_info{device="sdb",dm_uuid="",major="8",minor="0",name="",path="",uuid=""} 1
node_disk_info{device="sdc",dm_uuid="",major="8",minor="0",name="",path="",uuid=""} 1
node_disk_info{device="sr0",dm_uuid="",major="11",minor="0",name="",path="",uuid=""} 1
node_disk_info{device="vda",dm_uuid="",major="254",minor="0",name="",path="",uuid=""} 1
# HELP node_disk_io_now The number of I/Os currently in progress.
# TYPE node_disk_io_now gauge
node_disk_io_now{device="dm-0"} 0
Expand Down