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collector/diskstats: Add labels and metrics from udev

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Add labels to the `node_disk_info` metric extracted from udev, such as `model`,
`path`, `revision`, `serial` and `wwn`.

Also add a few metrics related to filesystem and device mapper, which are also
extracted from udev information.

Signed-off-by: Benoît Knecht <bknecht@protonmail.ch>
This commit is contained in:
Benoît Knecht 2022-06-14 09:57:52 +02:00 committed by Johannes 'fish' Ziemke
parent 3ed95908d6
commit a997b6096d
1 changed files with 148 additions and 7 deletions
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145
collector/diskstats_linux.go
View file

@ -17,8 +17,14 @@
package collector
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs/blockdevice"
)
@ -31,6 +37,29 @@ const (
unixSectorSize = 512.0
diskstatsDefaultIgnoredDevices = "^(ram|loop|fd|(h|s|v|xv)d[a-z]|nvme\\d+n\\d+p)\\d+$"
// udev attributes
udevDMLVLayer = "E:DM_LV_LAYER"
udevDMLVName = "E:DM_LV_NAME"
udevDMName = "E:DM_NAME"
udevDMUUID = "E:DM_UUID"
udevDMVGName = "E:DM_VG_NAME"
udevIDATA = "E:ID_ATA"
udevIDATARotationRateRPM = "E:ID_ATA_ROTATION_RATE_RPM"
udevIDATASATA = "E:ID_ATA_SATA"
udevIDATASATASignalRateGen1 = "E:ID_ATA_SATA_SIGNAL_RATE_GEN1"
udevIDATASATASignalRateGen2 = "E:ID_ATA_SATA_SIGNAL_RATE_GEN2"
udevIDATAWriteCache = "E:ID_ATA_WRITE_CACHE"
udevIDATAWriteCacheEnabled = "E:ID_ATA_WRITE_CACHE_ENABLED"
udevIDFSType = "E:ID_FS_TYPE"
udevIDFSUsage = "E:ID_FS_USAGE"
udevIDFSUUID = "E:ID_FS_UUID"
udevIDFSVersion = "E:ID_FS_VERSION"
udevIDModel = "E:ID_MODEL"
udevIDPath = "E:ID_PATH"
udevIDRevision = "E:ID_REVISION"
udevIDSerialShort = "E:ID_SERIAL_SHORT"
udevIDWWN = "E:ID_WWN"
)
type typedFactorDesc struct {
@ -38,6 +67,8 @@ type typedFactorDesc struct {
valueType prometheus.ValueType
}
type udevInfo map[string]string
func (d *typedFactorDesc) mustNewConstMetric(value float64, labels ...string) prometheus.Metric {
return prometheus.MustNewConstMetric(d.desc, d.valueType, value, labels...)
}
@ -47,6 +78,9 @@ type diskstatsCollector struct {
fs blockdevice.FS
infoDesc typedFactorDesc
descs []typedFactorDesc
filesystemInfoDesc typedFactorDesc
deviceMapperInfoDesc typedFactorDesc
ataDescs map[string]typedFactorDesc
logger log.Logger
}
@ -74,7 +108,7 @@ 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", "path", "wwn", "model", "serial", "revision"},
nil,
), valueType: prometheus.GaugeValue,
},
@ -181,6 +215,43 @@ func NewDiskstatsCollector(logger log.Logger) (Collector, error) {
), valueType: prometheus.CounterValue,
},
},
filesystemInfoDesc: typedFactorDesc{
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "filesystem_info"),
"Info about disk filesystem.",
[]string{"device", "type", "usage", "uuid", "version"},
nil,
), valueType: prometheus.GaugeValue,
},
deviceMapperInfoDesc: typedFactorDesc{
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "device_mapper_info"),
"Info about disk device mapper.",
[]string{"device", "name", "uuid", "vg_name", "lv_name", "lv_layer"},
nil,
), valueType: prometheus.GaugeValue,
},
ataDescs: map[string]typedFactorDesc{
udevIDATAWriteCache: {
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "ata_write_cache"),
"ATA disk has a write cache.",
[]string{"device"},
nil,
), valueType: prometheus.GaugeValue,
},
udevIDATAWriteCacheEnabled: {
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "ata_write_cache_enabled"),
"ATA disk has its write cache enabled.",
[]string{"device"},
nil,
), valueType: prometheus.GaugeValue,
},
udevIDATARotationRateRPM: {
desc: prometheus.NewDesc(prometheus.BuildFQName(namespace, diskSubsystem, "ata_rotation_rate_rpm"),
"ATA disk rotation rate in RPMs (0 for SSDs).",
[]string{"device"},
nil,
), valueType: prometheus.GaugeValue,
},
},
logger: logger,
}, nil
}
@ -196,7 +267,21 @@ func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
if c.deviceFilter.ignored(dev) {
continue
}
ch <- c.infoDesc.mustNewConstMetric(1.0, dev, fmt.Sprint(stats.MajorNumber), fmt.Sprint(stats.MinorNumber))
info, err := udevDeviceInformation(stats.MajorNumber, stats.MinorNumber)
if err != nil {
level.Error(c.logger).Log("msg", "Failed to parse udev info", "err", err)
}
ch <- c.infoDesc.mustNewConstMetric(1.0, dev,
fmt.Sprint(stats.MajorNumber),
fmt.Sprint(stats.MinorNumber),
info[udevIDPath],
info[udevIDWWN],
info[udevIDModel],
info[udevIDSerialShort],
info[udevIDRevision],
)
statCount := stats.IoStatsCount - 3 // Total diskstats record count, less MajorNumber, MinorNumber and DeviceName
@ -224,6 +309,62 @@ func (c *diskstatsCollector) Update(ch chan<- prometheus.Metric) error {
}
ch <- c.descs[i].mustNewConstMetric(val, dev)
}
if fsType := info[udevIDFSType]; fsType != "" {
ch <- c.filesystemInfoDesc.mustNewConstMetric(1.0, dev,
fsType,
info[udevIDFSUsage],
info[udevIDFSUUID],
info[udevIDFSVersion],
)
}
if name := info[udevDMName]; name != "" {
ch <- c.deviceMapperInfoDesc.mustNewConstMetric(1.0, dev,
name,
info[udevDMUUID],
info[udevDMVGName],
info[udevDMLVName],
info[udevDMLVLayer],
)
}
if ata := info[udevIDATA]; ata != "" {
for attr, desc := range c.ataDescs {
str, ok := info[attr]
if !ok {
level.Debug(c.logger).Log("msg", "Udev attribute does not exist", "attribute", attr)
continue
}
if value, err := strconv.ParseFloat(str, 64); err == nil {
ch <- desc.mustNewConstMetric(value, dev)
} else {
level.Error(c.logger).Log("msg", "Failed to parse ATA value", "err", err)
}
}
}
}
return nil
}
func udevDeviceInformation(major, minor uint32) (udevInfo, error) {
filename := fmt.Sprintf("/run/udev/data/b%d:%d", major, minor)
data, err := os.Open(filename)
if err != nil {
return nil, err
}
defer data.Close()
info := make(udevInfo)
scanner := bufio.NewScanner(data)
for scanner.Scan() {
if name, value, found := strings.Cut(scanner.Text(), "="); found {
info[name] = value
}
}
return info, nil
}