compact duplicate external hostnames

Author: sanchezl

go.mod

@@ -42,6 +42,7 @@ require (
 	github.com/prometheus/common v0.44.0
 	github.com/spf13/cobra v1.6.1
 	github.com/stretchr/testify v1.9.0
+	golang.org/x/exp v0.0.0-20220827204233-334a2380cb91
 	golang.org/x/net v0.27.0
 	golang.org/x/oauth2 v0.8.0
 	golang.org/x/time v0.3.0

go.sum

@@ -1177,6 +1177,7 @@ golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u0
 golang.org/x/exp v0.0.0-20200119233911-0405dc783f0a/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
 golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EHIKF9dgMWnmCNThgcyBT1FY9mM=
 golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6/go.mod h1:3jZMyOhIsHpP37uCMkUooju7aAi5cS1Q23tOzKc+0MU=
+golang.org/x/exp v0.0.0-20220827204233-334a2380cb91 h1:tnebWN09GYg9OLPss1KXj8txwZc6X6uMr6VFdcGNbHw=
 golang.org/x/exp v0.0.0-20220827204233-334a2380cb91/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
 golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=
 golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=

pkg/operator/imageconfig.go

@@ -8,6 +8,8 @@ import (
 	"strings"
 	"time"
 
+	"golang.org/x/exp/slices"
+
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
@@ -254,6 +256,9 @@ func (icc *ImageConfigController) getRouteHostnames() ([]string, error) {
 	// downstream controllers that watch this array
 	sort.Strings(routeNames)
 
+	// remove duplicates
+	routeNames = slices.Compact(routeNames)
+
 	// make sure the default route hostname comes first in the list because the
 	// first entry will be used as the public repository hostname by the cluster
 	// configuration