ston1th/node_exporter
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Add an exporter for /proc/net/netstat, enabled by default.

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This catches things like listen overflows, retransmits
and other things that are very useful for retroactive debugging
thus I think it's justified to have it on by default.
This commit is contained in:
Brian Brazil 2014-11-11 15:24:35 +00:00
commit 96eaff8c7e
3 changed files with 122 additions and 20 deletions
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38
collector/netdev.go
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@ -14,12 +14,12 @@ import (
)
const (
procNetDev = "/proc/net/dev"
netStatsSubsystem = "network"
procNetDev = "/proc/net/dev"
netDevSubsystem = "network"
)
var (
netStatsMetrics = map[string]*prometheus.GaugeVec{}
netDevMetrics = map[string]*prometheus.GaugeVec{}
)
type netDevCollector struct {
@ -40,19 +40,19 @@ func NewNetDevCollector(config Config) (Collector, error) {
}
func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
netStats, err := getNetStats()
netDev, err := getNetDevStats()
if err != nil {
return fmt.Errorf("Couldn't get netstats: %s", err)
}
for direction, devStats := range netStats {
for direction, devStats := range netDev {
for dev, stats := range devStats {
for t, value := range stats {
key := direction + "_" + t
if _, ok := netStatsMetrics[key]; !ok {
netStatsMetrics[key] = prometheus.NewGaugeVec(
if _, ok := netDevMetrics[key]; !ok {
netDevMetrics[key] = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Subsystem: netStatsSubsystem,
Subsystem: netDevSubsystem,
Name: key,
Help: fmt.Sprintf("%s %s from /proc/net/dev.", t, direction),
},
@ -63,29 +63,29 @@ func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
if err != nil {
return fmt.Errorf("Invalid value %s in netstats: %s", value, err)
}
netStatsMetrics[key].WithLabelValues(dev).Set(v)
netDevMetrics[key].WithLabelValues(dev).Set(v)
}
}
}
for _, m := range netStatsMetrics {
for _, m := range netDevMetrics {
m.Collect(ch)
}
return err
}
func getNetStats() (map[string]map[string]map[string]string, error) {
func getNetDevStats() (map[string]map[string]map[string]string, error) {
file, err := os.Open(procNetDev)
if err != nil {
return nil, err
}
return parseNetStats(file)
return parseNetDevStats(file)
}
func parseNetStats(r io.ReadCloser) (map[string]map[string]map[string]string, error) {
func parseNetDevStats(r io.ReadCloser) (map[string]map[string]map[string]string, error) {
defer r.Close()
netStats := map[string]map[string]map[string]string{}
netStats["transmit"] = map[string]map[string]string{}
netStats["receive"] = map[string]map[string]string{}
netDev := map[string]map[string]map[string]string{}
netDev["transmit"] = map[string]map[string]string{}
netDev["receive"] = map[string]map[string]string{}
scanner := bufio.NewScanner(r)
scanner.Scan() // skip first header
@ -113,10 +113,10 @@ func parseNetStats(r io.ReadCloser) (map[string]map[string]map[string]string, er
if err != nil {
return nil, err
}
netStats["transmit"][dev] = transmit
netStats["receive"][dev] = receive
netDev["transmit"][dev] = transmit
netDev["receive"][dev] = receive
}
return netStats, nil
return netDev, nil
}
func parseNetDevLine(parts []string, header []string) (map[string]string, error) {