280 lines
7.8 KiB
Go
280 lines
7.8 KiB
Go
package prometheus
|
|
|
|
import (
|
|
"fmt"
|
|
"runtime"
|
|
"runtime/debug"
|
|
"time"
|
|
)
|
|
|
|
type goCollector struct {
|
|
goroutines Gauge
|
|
gcDesc *Desc
|
|
|
|
// metrics to describe and collect
|
|
metrics memStatsMetrics
|
|
}
|
|
|
|
// NewGoCollector returns a collector which exports metrics about the current
|
|
// go process.
|
|
func NewGoCollector() *goCollector {
|
|
return &goCollector{
|
|
goroutines: NewGauge(GaugeOpts{
|
|
Namespace: "go",
|
|
Name: "goroutines",
|
|
Help: "Number of goroutines that currently exist.",
|
|
}),
|
|
gcDesc: NewDesc(
|
|
"go_gc_duration_seconds",
|
|
"A summary of the GC invocation durations.",
|
|
nil, nil),
|
|
metrics: memStatsMetrics{
|
|
{
|
|
desc: NewDesc(
|
|
memstatNamespace("alloc_bytes"),
|
|
"Number of bytes allocated and still in use.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.Alloc) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("alloc_bytes_total"),
|
|
"Total number of bytes allocated, even if freed.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.TotalAlloc) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("sys_bytes"),
|
|
"Number of bytes obtained from system",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.Sys) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("lookups_total"),
|
|
"Total number of pointer lookups.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.Lookups) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("mallocs_total"),
|
|
"Total number of mallocs.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.Mallocs) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("frees_total"),
|
|
"Total number of frees.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.Frees) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("heap_alloc_bytes"),
|
|
"Number heap bytes allocated and still in use.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.HeapAlloc) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("heap_sys_bytes"),
|
|
"Total bytes in heap obtained from system.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.HeapSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("heap_idle_bytes"),
|
|
"Number bytes in heap waiting to be used.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.HeapIdle) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("heap_inuse_bytes"),
|
|
"Number of bytes in heap that are in use.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.HeapInuse) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("heap_released_bytes"),
|
|
"Number of bytes in heap released to OS.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.HeapReleased) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("heap_objects"),
|
|
"Number of allocated objects.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.HeapObjects) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("stack_bytes_inuse"),
|
|
"Number of bytes in use by the stack allocator.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.StackInuse) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("stack_sys_bytes"),
|
|
"Number of bytes in obtained from system for stack allocator.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.StackSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("mspan_inuse"),
|
|
"Number of mspan structures in use.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.MSpanInuse) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("mspan_sys"),
|
|
"Number of mspan structures obtained from system.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.MSpanSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("mcache_inuse"),
|
|
"Number of mcache structures in use.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.MCacheInuse) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("mcache_sys"),
|
|
"Number of mcache structures obtained from system.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.MCacheSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("buck_hash_sys"),
|
|
"Profiling bucket hash table.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.BuckHashSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("gc_metadata"),
|
|
"GC metadata.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.GCSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("other_sys"),
|
|
"Other system allocations.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.OtherSys) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("next_gc"),
|
|
"Next collection will happen when HeapAlloc ≥ this amount.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.NextGC) },
|
|
valType: GaugeValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("last_gc"),
|
|
"End time of last garbage collection (nanoseconds since 1970).",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.LastGC) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("pause_total"),
|
|
"Total garbage collection pauses for all collections.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.PauseTotalNs) },
|
|
valType: CounterValue,
|
|
}, {
|
|
desc: NewDesc(
|
|
memstatNamespace("gc_total"),
|
|
"Number of garbage collection.",
|
|
nil, nil,
|
|
),
|
|
eval: func(ms *runtime.MemStats) float64 { return float64(ms.NumGC) },
|
|
valType: CounterValue,
|
|
},
|
|
},
|
|
}
|
|
}
|
|
|
|
func memstatNamespace(s string) string {
|
|
return fmt.Sprintf("go_memstats_%s", s)
|
|
}
|
|
|
|
// Describe returns all descriptions of the collector.
|
|
func (c *goCollector) Describe(ch chan<- *Desc) {
|
|
ch <- c.goroutines.Desc()
|
|
ch <- c.gcDesc
|
|
|
|
for _, i := range c.metrics {
|
|
ch <- i.desc
|
|
}
|
|
}
|
|
|
|
// Collect returns the current state of all metrics of the collector.
|
|
func (c *goCollector) Collect(ch chan<- Metric) {
|
|
c.goroutines.Set(float64(runtime.NumGoroutine()))
|
|
ch <- c.goroutines
|
|
|
|
var stats debug.GCStats
|
|
stats.PauseQuantiles = make([]time.Duration, 5)
|
|
debug.ReadGCStats(&stats)
|
|
|
|
quantiles := make(map[float64]float64)
|
|
for idx, pq := range stats.PauseQuantiles[1:] {
|
|
quantiles[float64(idx+1)/float64(len(stats.PauseQuantiles)-1)] = pq.Seconds()
|
|
}
|
|
quantiles[0.0] = stats.PauseQuantiles[0].Seconds()
|
|
ch <- MustNewConstSummary(c.gcDesc, uint64(stats.NumGC), float64(stats.PauseTotal.Seconds()), quantiles)
|
|
|
|
ms := &runtime.MemStats{}
|
|
runtime.ReadMemStats(ms)
|
|
for _, i := range c.metrics {
|
|
ch <- MustNewConstMetric(i.desc, i.valType, i.eval(ms))
|
|
}
|
|
}
|
|
|
|
// memStatsMetrics provide description, value, and value type for memstat metrics.
|
|
type memStatsMetrics []struct {
|
|
desc *Desc
|
|
eval func(*runtime.MemStats) float64
|
|
valType ValueType
|
|
}
|