Fix the Prometheus address references (#1237)

workflow/metrics/server.go

@@ -2,6 +2,7 @@ package metrics
 
 import (
 	"context"
+	"fmt"
 	"net/http"
 
 	"github.com/prometheus/client_golang/prometheus"
@@ -20,15 +21,15 @@ type PrometheusConfig struct {
 func RunServer(ctx context.Context, config PrometheusConfig, registry *prometheus.Registry) {
 	mux := http.NewServeMux()
 	mux.Handle(config.Path, promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))
-	srv := &http.Server{Addr: config.Port, Handler: mux}
+	srv := &http.Server{Addr: fmt.Sprintf(":%s", config.Port), Handler: mux}
 
 	defer func() {
 		if cerr := srv.Close(); cerr != nil {
 			log.Fatalf("Encountered an '%s' error when tried to close the metrics server running on '%s'", cerr, config.Port)
 		}
 	}()
 
-	log.Infof("Starting prometheus metrics server at 0.0.0.0%s%s", config.Port, config.Path)
+	log.Infof("Starting prometheus metrics server at 0.0.0.0:%s%s", config.Port, config.Path)
 	if err := srv.ListenAndServe(); err != nil {
 		panic(err)
 	}