faas-rs/faas
1
0
Fork 0
mirror of https://github.com/openfaas/faas.git synced 2025-06-28 09:43:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

Changed Metrics to be exposed via Exporter

Browse Source 
This change exposes the gateway metrics with an exporter which
implements the Collector interface of prometheus.
This change Fixes #697

Signed-off-by: Ken Fukuyama <kenfdev@gmail.com>
This commit is contained in:
Ken Fukuyama
2018-08-07 07:33:25 +09:00
committed by Alex Ellis
parent 6d6a487711
commit 4fabd50799
4 changed files with 134 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

45
gateway/metrics/exporter.go
View File

@ -14,9 +14,46 @@ import (
"log"
"github.com/openfaas/faas/gateway/requests"
"github.com/prometheus/client_golang/prometheus"
)
func AttachExternalWatcher(endpointURL url.URL, metricsOptions MetricOptions, label string, interval time.Duration) {
// Exporter is a prometheus exporter
type Exporter struct {
metricOptions MetricOptions
services []requests.Function
}
// NewExporter creates a new exporter for the OpenFaaS gateway metrics
func NewExporter(options MetricOptions) *Exporter {
return &Exporter{
metricOptions: options,
services: []requests.Function{},
}
}
// Describe is to describe the metrics for Prometheus
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
e.metricOptions.GatewayFunctionInvocation.Describe(ch)
e.metricOptions.GatewayFunctionsHistogram.Describe(ch)
e.metricOptions.ServiceReplicasCounter.Describe(ch)
}
// Collect collects data to be consumed by prometheus
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
e.metricOptions.GatewayFunctionInvocation.Collect(ch)
e.metricOptions.GatewayFunctionsHistogram.Collect(ch)
e.metricOptions.ServiceReplicasCounter.Reset()
for _, service := range e.services {
e.metricOptions.ServiceReplicasCounter.
WithLabelValues(service.Name).
Set(float64(service.Replicas))
}
e.metricOptions.ServiceReplicasCounter.Collect(ch)
}
// StartServiceWatcher starts a ticker and collects service replica counts to expose to prometheus
func (e *Exporter) StartServiceWatcher(endpointURL url.URL, metricsOptions MetricOptions, label string, interval time.Duration) {
ticker := time.NewTicker(interval)
quit := make(chan struct{})
proxyClient := http.Client{
@ -57,11 +94,7 @@ func AttachExternalWatcher(endpointURL url.URL, metricsOptions MetricOptions, la
continue
}
for _, service := range services {
metricsOptions.ServiceReplicasCounter.
WithLabelValues(service.Name).
Set(float64(service.Replicas))
}
e.services = services
break
case <-quit: