prom-to-sd: Fix not respecting --api-override

prometheus-to-sd/main.go

@@ -149,6 +149,28 @@ func main() {
 		options = append(options, option.WithTokenSource(ts))
 	}
 
+	if *apioverride != "" {
+		// option.WithEndpoint() only works with "host:port"
+		u, err := url.Parse(*apioverride)
+		if err != nil {
+			glog.Fatalf("Failed to parse api override: %v", err)
+		}
+		port := u.Port()
+		if port == "" {
+			switch u.Scheme {
+			case "https":
+				port = "443"
+			case "http":
+				port = "80"
+			case "":
+				port = "80"
+			default:
+				glog.Fatalf("Unrecognized scheme: %s in --api-override", u.Scheme)
+			}
+		}
+		options = append(options, option.WithEndpoint(fmt.Sprintf("%s:%s", u.Host, port)))
+	}
+
 	ctx := context.Background()
 	client, err := monitoring.NewMetricClient(ctx, options...)
 	if err != nil {