Upgrading server dependancies (#8154)

vendor/github.com/prometheus/client_golang/examples/simple/Dockerfile

@@ -0,0 +1,20 @@
+# This Dockerfile builds an image for a client_golang example.
+#
+# Use as (from the root for the client_golang repository):
+#    docker build -f examples/$name/Dockerfile -t prometheus/golang-example-$name .
+
+# Builder image, where we build the example.
+FROM golang:1.9.0 AS builder
+WORKDIR /go/src/github.com/prometheus/client_golang
+COPY . .
+WORKDIR /go/src/github.com/prometheus/client_golang/prometheus
+RUN go get -d
+WORKDIR /go/src/github.com/prometheus/client_golang/examples/simple
+RUN CGO_ENABLED=0 GOOS=linux go build -a -tags netgo -ldflags '-w'
+
+# Final image.
+FROM scratch
+LABEL maintainer "The Prometheus Authors <prometheus-developers@googlegroups.com>"
+COPY --from=builder /go/src/github.com/prometheus/client_golang/examples/simple .
+EXPOSE 8080
+ENTRYPOINT ["/simple"]

vendor/github.com/prometheus/client_golang/examples/simple/main.go

@@ -16,15 +16,16 @@ 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()
-	http.Handle("/metrics", prometheus.Handler())
-	http.ListenAndServe(*addr, nil)
+	http.Handle("/metrics", promhttp.Handler())
+	log.Fatal(http.ListenAndServe(*addr, nil))
 }