// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// A minimal example of how to include Prometheus instrumentation.
package main

import (
	"flag"
	"log"
	"net/http"
	
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")

func main() {
	flag.Parse()

	// Create non-global registry.
	reg := prometheus.NewRegistry()

	// Expose /metrics HTTP endpoint using the created custom registry.
	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
	log.Fatal(http.ListenAndServe(*addr, nil))
}

// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// A minimal example of how to include Prometheus instrumentation.
package main

import (
	"flag"
	"log"
	"net/http"

	"github.com/prometheus/client_golang/prometheus/promhttp"
)

var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")

func main() {
	flag.Parse()
	http.Handle("/metrics", promhttp.Handler())
	log.Fatal(http.ListenAndServe(*addr, nil))
}

--- 
+++ 
@@ -18,7 +18,8 @@
 	"flag"
 	"log"
 	"net/http"
-
+	
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
@@ -26,6 +27,11 @@
 
 func main() {
 	flag.Parse()
-	http.Handle("/metrics", promhttp.Handler())
+
+	// Create non-global registry.
+	reg := prometheus.NewRegistry()
+
+	// Expose /metrics HTTP endpoint using the created custom registry.
+	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{Registry: reg}))
 	log.Fatal(http.ListenAndServe(*addr, nil))
 }
Update simple example to use custom registry

Signed-off-by: Jéssica Lins <cdcbb7b12268316ca09e62f2c9c76365993642da@gmail.com>
