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add username label to metrics #5

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merged 1 commit into from
Oct 2, 2024
Merged

add username label to metrics #5

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49 changes: 35 additions & 14 deletions metrics.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,8 @@ import (
"context"
"log"
"net/http"
"os/user"
"regexp"

systemd "github.com/coreos/go-systemd/v22/dbus"
"github.com/prometheus/client_golang/prometheus"
Expand All @@ -22,8 +24,8 @@ func MetricsHandler(pattern string, collectProc bool) http.HandlerFunc {
}

var namespace = "systemd_unit"
var labels = []string{"unit"}
var procLabels = []string{"unit", "proc"}
var labels = []string{"unit", "username"}
var procLabels = []string{"unit", "username", "proc"}

const NSPerSec = 1000000000 // billion

Expand Down Expand Up @@ -55,6 +57,7 @@ type Metric struct {
cpuAccounting bool
cpuUsage uint64
unit string
username string
processes map[string]*Process
}

Expand Down Expand Up @@ -115,20 +118,20 @@ func (c *Collector) Describe(ch chan<- *prometheus.Desc) {
func (c *Collector) Collect(ch chan<- prometheus.Metric) {
metrics := c.collectMetrics()
for _, m := range metrics {
ch <- prometheus.MustNewConstMetric(c.memoryAccounting, prometheus.GaugeValue, b2f(m.memoryAccounting), m.unit)
ch <- prometheus.MustNewConstMetric(c.memoryMax, prometheus.GaugeValue, float64(m.memoryMax), m.unit)
ch <- prometheus.MustNewConstMetric(c.memoryMin, prometheus.GaugeValue, float64(m.memoryMin), m.unit)
ch <- prometheus.MustNewConstMetric(c.memoryHigh, prometheus.GaugeValue, float64(m.memoryHigh), m.unit)
ch <- prometheus.MustNewConstMetric(c.memoryLow, prometheus.GaugeValue, float64(m.memoryLow), m.unit)
ch <- prometheus.MustNewConstMetric(c.memoryCurrent, prometheus.GaugeValue, float64(m.memoryCurrent), m.unit)
ch <- prometheus.MustNewConstMetric(c.cpuAccounting, prometheus.GaugeValue, b2f(m.cpuAccounting), m.unit)
ch <- prometheus.MustNewConstMetric(c.cpuUsage, prometheus.CounterValue, float64(m.cpuUsage), m.unit)
ch <- prometheus.MustNewConstMetric(c.cpuQuota, prometheus.CounterValue, float64(m.cpuQuota), m.unit)
ch <- prometheus.MustNewConstMetric(c.memoryAccounting, prometheus.GaugeValue, b2f(m.memoryAccounting), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.memoryMax, prometheus.GaugeValue, float64(m.memoryMax), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.memoryMin, prometheus.GaugeValue, float64(m.memoryMin), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.memoryHigh, prometheus.GaugeValue, float64(m.memoryHigh), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.memoryLow, prometheus.GaugeValue, float64(m.memoryLow), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.memoryCurrent, prometheus.GaugeValue, float64(m.memoryCurrent), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.cpuAccounting, prometheus.GaugeValue, b2f(m.cpuAccounting), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.cpuUsage, prometheus.CounterValue, float64(m.cpuUsage), m.unit, m.username)
ch <- prometheus.MustNewConstMetric(c.cpuQuota, prometheus.CounterValue, float64(m.cpuQuota), m.unit, m.username)
if c.collectProc {
for name, p := range m.processes {
ch <- prometheus.MustNewConstMetric(c.procCPU, prometheus.GaugeValue, p.cpu, m.unit, name)
ch <- prometheus.MustNewConstMetric(c.procMemory, prometheus.GaugeValue, float64(p.memory), m.unit, name)
ch <- prometheus.MustNewConstMetric(c.procCount, prometheus.GaugeValue, float64(p.count), m.unit, name)
ch <- prometheus.MustNewConstMetric(c.procCPU, prometheus.GaugeValue, p.cpu, m.unit, m.username, name)
ch <- prometheus.MustNewConstMetric(c.procMemory, prometheus.GaugeValue, float64(p.memory), m.unit, m.username, name)
ch <- prometheus.MustNewConstMetric(c.procCount, prometheus.GaugeValue, float64(p.count), m.unit, m.username, name)
}
}
}
Expand Down Expand Up @@ -169,6 +172,7 @@ func (c *Collector) collectMetrics() []Metric {
cpuUsage: props["CPUUsageNSec"].(uint64),
cpuQuota: int64(props["CPUQuotaPerSecUSec"].(uint64)),
unit: unit.Name,
username: lookupUsername(unit),
}
if c.collectProc {
procs, err := collectProcesses(conn, ctx, unit.Name)
Expand Down Expand Up @@ -232,6 +236,23 @@ func collectProcesses(conn *systemd.Conn, ctx context.Context, unit string) (map
return processes, nil
}

func lookupUsername(unit systemd.UnitStatus) string {
pattern := `^user-(\d+)\.slice$`
re := regexp.MustCompile(pattern)
match := re.FindStringSubmatch(unit.Name)

if len(match) < 1 {
return "unknown user"
}

user, err := user.LookupId(match[1])
if err != nil {
return "unknown user"
}

return user.Username
}

func b2f(b bool) float64 {
if !b {
return -1.0
Expand Down