Differentiate liveness and readiness probes for router pods

Add a backend to the router controller "/livez" that always returns true. This differentiates the liveness and
readiness probes so that a router can be alive and not ready.

Bug 1550007

pkg/oc/admin/router/router.go

@@ -436,7 +436,7 @@ func generateSecretsConfig(cfg *RouterConfig, namespace string, defaultCert []by
 	return secrets, volumes, mounts, nil
 }
 
-func generateProbeConfigForRouter(cfg *RouterConfig, ports []kapi.ContainerPort) *kapi.Probe {
+func generateProbeConfigForRouter(path string, cfg *RouterConfig, ports []kapi.ContainerPort) *kapi.Probe {
 	var probe *kapi.Probe
 
 	if cfg.Type == "haproxy-router" {
@@ -447,7 +447,7 @@ func generateProbeConfigForRouter(cfg *RouterConfig, ports []kapi.ContainerPort)
 		}
 
 		probe.Handler.HTTPGet = &kapi.HTTPGetAction{
-			Path: "/healthz",
+			Path: path,
 			Port: intstr.IntOrString{
 				Type:   intstr.Int,
 				IntVal: int32(healthzPort),
@@ -466,15 +466,15 @@ func generateProbeConfigForRouter(cfg *RouterConfig, ports []kapi.ContainerPort)
 }
 
 func generateLivenessProbeConfig(cfg *RouterConfig, ports []kapi.ContainerPort) *kapi.Probe {
-	probe := generateProbeConfigForRouter(cfg, ports)
+	probe := generateProbeConfigForRouter("/livez", cfg, ports)
 	if probe != nil {
 		probe.InitialDelaySeconds = 10
 	}
 	return probe
 }
 
 func generateReadinessProbeConfig(cfg *RouterConfig, ports []kapi.ContainerPort) *kapi.Probe {
-	probe := generateProbeConfigForRouter(cfg, ports)
+	probe := generateProbeConfigForRouter("/healthz", cfg, ports)
 	if probe != nil {
 		probe.InitialDelaySeconds = 10
 	}

pkg/router/metrics/metrics.go

@@ -37,6 +37,10 @@ type Listener struct {
 func (l Listener) handler() http.Handler {
 	mux := http.NewServeMux()
 	healthz.InstallHandler(mux, l.Checks...)
+	mux.Handle("/livez", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, "ok")
+		return
+	}))
 
 	if l.Authenticator != nil {
 		protected := http.NewServeMux()