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Use perflib for system collector

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This commit is contained in:
Ben Reedy 2019-09-25 04:06:31 +00:00
parent 2688847c2e
commit 2aafa9ebf3
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GPG Key ID: 235C15B6086C9D7E
2 changed files with 18 additions and 26 deletions
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43
collector/system.go
View File

@ -3,8 +3,6 @@
package collector
import (
"errors"
"github.com/StackExchange/wmi"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
)
@ -70,7 +68,7 @@ func NewSystemCollector() (Collector, error) {
// Collect sends the metric values for each metric
// to the provided prometheus Metric channel.
func (c *SystemCollector) Collect(ctx *ScrapeContext, ch chan<- prometheus.Metric) error {
if desc, err := c.collect(ch); err != nil {
if desc, err := c.collect(ctx, ch); err != nil {
log.Error("failed collecting system metrics:", desc, err)
return err
}
@ -79,57 +77,50 @@ func (c *SystemCollector) Collect(ctx *ScrapeContext, ch chan<- prometheus.Metri
// Win32_PerfRawData_PerfOS_System docs:
// - https://web.archive.org/web/20050830140516/http://msdn.microsoft.com/library/en-us/wmisdk/wmi/win32_perfrawdata_perfos_system.asp
type Win32_PerfRawData_PerfOS_System struct {
ContextSwitchesPersec uint32
ExceptionDispatchesPersec uint32
Frequency_Object uint64
ProcessorQueueLength uint32
SystemCallsPersec uint32
SystemUpTime uint64
Threads uint32
Timestamp_Object uint64
type system struct {
ContextSwitchesPersec float64 `perflib:"Context Switches/sec"`
ExceptionDispatchesPersec float64 `perflib:"Exception Dispatches/sec"`
ProcessorQueueLength float64 `perflib:"Processor Queue Length"`
SystemCallsPersec float64 `perflib:"System Calls/sec"`
SystemUpTime float64 `perflib:"System Up Time"`
Threads float64 `perflib:"Threads"`
}
func (c *SystemCollector) collect(ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
var dst []Win32_PerfRawData_PerfOS_System
q := queryAll(&dst)
if err := wmi.Query(q, &dst); err != nil {
func (c *SystemCollector) collect(ctx *ScrapeContext, ch chan<- prometheus.Metric) (*prometheus.Desc, error) {
var dst []system
if err := unmarshalObject(ctx.perfObjects["System"], &dst); err != nil {
return nil, err
}
if len(dst) == 0 {
return nil, errors.New("WMI query returned empty result set")
}
ch <- prometheus.MustNewConstMetric(
c.ContextSwitchesTotal,
prometheus.CounterValue,
float64(dst[0].ContextSwitchesPersec),
dst[0].ContextSwitchesPersec,
)
ch <- prometheus.MustNewConstMetric(
c.ExceptionDispatchesTotal,
prometheus.CounterValue,
float64(dst[0].ExceptionDispatchesPersec),
dst[0].ExceptionDispatchesPersec,
)
ch <- prometheus.MustNewConstMetric(
c.ProcessorQueueLength,
prometheus.GaugeValue,
float64(dst[0].ProcessorQueueLength),
dst[0].ProcessorQueueLength,
)
ch <- prometheus.MustNewConstMetric(
c.SystemCallsTotal,
prometheus.CounterValue,
float64(dst[0].SystemCallsPersec),
dst[0].SystemCallsPersec,
)
ch <- prometheus.MustNewConstMetric(
c.SystemUpTime,
prometheus.GaugeValue,
// convert from Windows timestamp (1 jan 1601) to unix timestamp (1 jan 1970)
float64(dst[0].SystemUpTime-116444736000000000)/float64(dst[0].Frequency_Object),
dst[0].SystemUpTime,
)
ch <- prometheus.MustNewConstMetric(
c.Threads,
prometheus.GaugeValue,
float64(dst[0].Threads),
dst[0].Threads,
)
return nil, nil
}

1
docs/collector.system.md
View File

@ -5,6 +5,7 @@ The system collector exposes metrics about ...
|||
-|-
Metric name prefix | `system`
Data source | Perflib
Classes | [`Win32_PerfRawData_PerfOS_System`](https://web.archive.org/web/20050830140516/http://msdn.microsoft.com/library/en-us/wmisdk/wmi/win32_perfrawdata_perfos_system.asp)
Enabled by default? | Yes