Update comment in OpenCensus example

Signed-off-by: Xabier Larrakoetxea <[email protected]>

examples/gin/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	prommiddleware "github.com/slok/go-prometheus-middleware"
+	promgin "github.com/slok/go-prometheus-middleware/gin"
+)
+
+const (
+	srvAddr     = ":8080"
+	metricsAddr = ":8081"
+)
+
+func main() {
+	// Create our middleware.
+	mdlw := prommiddleware.NewDefault()
+
+	// Create our gin instance.
+	r := gin.New()
+
+	// Add the middlewares to all gin routes.
+	r.Use(
+		promgin.Handler("", mdlw),
+		gin.Logger(),
+	)
+
+	// Add our handler
+	r.GET("/", func(c *gin.Context) {
+		c.String(http.StatusOK, "Hello world!")
+	})
+
+	// Serve our handler.
+	go func() {
+		log.Printf("server listening at %s", srvAddr)
+		if err := r.Run(srvAddr); err != nil {
+			log.Panicf("error while serving: %s", err)
+		}
+	}()
+
+	// Serve our metrics.
+	go func() {
+		log.Printf("metrics listening at %s", metricsAddr)
+		if err := http.ListenAndServe(metricsAddr, promhttp.Handler()); err != nil {
+			log.Panicf("error while serving metrics: %s", err)
+		}
+	}()
+
+	// Wait until some signal is captured.
+	sigC := make(chan os.Signal, 1)
+	signal.Notify(sigC, syscall.SIGTERM, syscall.SIGINT)
+	<-sigC
+}

examples/opencensus/main.go

@@ -19,13 +19,8 @@ const (
 	metricsAddr = ":8081"
 )
 
-// this example will show the simplest way of enabling the middleware
-// using go std handlers without frameworks with the Prometheues recorder.
-// it uses the prometheus default registry, the middleware default options
-// and doesn't set the handler ID, so the middleware will set the handler id
-// (handler label) to the request URL, WARNING: this creates high cardinality because
-// `/profile/123` and `/profile/567` are different handlers. If you want to be safer
-// you will need to tell the middleware what is the handler id.
+// This example will show how you could use opencensus with go-http-middleware
+// and serve the metrics in Prometheus format (through OpenCensus).
 func main() {
 	// Create OpenCensus with Prometheus.
 	ocexporter, err := ocprometheus.NewExporter(ocprometheus.Options{})