/
metrics.go
81 lines (68 loc) · 2.19 KB
/
metrics.go
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package router
import (
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
)
func init() {
prometheus.MustRegister(metricEventsReceived)
prometheus.MustRegister(metricEventsProcessed)
prometheus.MustRegister(metricEventsDropped)
prometheus.MustRegister(metricBacklog)
prometheus.MustRegister(metricProcessingDuration)
}
const customEventType = "custom"
var metricEventsReceived = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "eventgateway",
Subsystem: "events",
Name: "received_total",
Help: "Total of events received.",
}, []string{"space", "type"})
var metricEventsProcessed = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "eventgateway",
Subsystem: "events",
Name: "processed_total",
Help: "Total of processed events.",
}, []string{"space", "type"})
var metricEventsDropped = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: "eventgateway",
Subsystem: "events",
Name: "dropped_total",
Help: "Total of events dropped due to insufficient processing power.",
}, []string{"space", "type"})
var metricBacklog = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "eventgateway",
Subsystem: "events",
Name: "backlog",
Help: "Gauge of asynchronous events count waiting to be processed.",
})
var metricProcessingDuration = prometheus.NewHistogram(
prometheus.HistogramOpts{
Namespace: "eventgateway",
Subsystem: "events",
Name: "custom_processing_seconds",
Help: "Bucketed histogram of processing duration of an event. " +
"From receiving the asynchronous custom event to calling a function.",
Buckets: prometheus.ExponentialBuckets(0.00001, 2, 20),
})
var receivedEventsMutex = sync.Mutex{}
var receivedEvents = map[string]time.Time{}
func reportEventInTheQueue(id string) {
receivedEventsMutex.Lock()
defer receivedEventsMutex.Unlock()
if _, ok := receivedEvents[id]; !ok {
receivedEvents[id] = time.Now()
}
}
func reportEventOutOfQueue(id string) {
receivedEventsMutex.Lock()
defer receivedEventsMutex.Unlock()
if startTime, ok := receivedEvents[id]; ok {
metricProcessingDuration.Observe(time.Since(startTime).Seconds())
delete(receivedEvents, id)
}
}