Merge pull request #935 from prometheus/beorn7/examples

example/random: Move flags and metrics into main()

examples/random/main.go

@@ -29,15 +29,18 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
-var (
+func main() {
+	var (
 		addr              = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.")
 		uniformDomain     = flag.Float64("uniform.domain", 0.0002, "The domain for the uniform distribution.")
 		normDomain        = flag.Float64("normal.domain", 0.0002, "The domain for the normal distribution.")
 		normMean          = flag.Float64("normal.mean", 0.00001, "The mean for the normal distribution.")
 		oscillationPeriod = flag.Duration("oscillation-period", 10*time.Minute, "The duration of the rate oscillation period.")
-)
+	)
 
-var (
+	flag.Parse()
+
+	var (
 		// Create a summary to track fictional interservice RPC latencies for three
 		// distinct services with different latency distributions. These services are
 		// differentiated via a "service" label.
@@ -58,18 +61,13 @@ var (
 			Help:    "RPC latency distributions.",
 			Buckets: prometheus.LinearBuckets(*normMean-5**normDomain, .5**normDomain, 20),
 		})
-)
+	)
 
-func init() {
 	// Register the summary and the histogram with Prometheus's default registry.
 	prometheus.MustRegister(rpcDurations)
 	prometheus.MustRegister(rpcDurationsHistogram)
 	// Add Go module build info.
 	prometheus.MustRegister(prometheus.NewBuildInfoCollector())
-}
-
-func main() {
-	flag.Parse()
 
 	start := time.Now()