Use backend None as the "not found" sentinel, and only define it once.

container/bogo_backend.vcl

@@ -4,8 +4,4 @@
 # - Defined when the Ingress is not ready (not currently implementing
 #   any IngressSpec), so that Varnish doesn't complain about no
 #   backend definition.
-backend notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+backend vk8s_notfound None;

pkg/varnish/vcl/testdata/backendcfg.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 probe vk8s_coffee-svc_probe {
 	.request =

pkg/varnish/vcl/testdata/custom_vcl.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_coffee-svc_192_0_2_4 {
 	.host = "192.0.2.4";

pkg/varnish/vcl/testdata/extname.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_coffee-svc_192_0_2_4 {
 	.host = "192.0.2.4";

pkg/varnish/vcl/testdata/extname_bcfg.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 probe vk8s_metaxa-svc_probe {
 	.request =

pkg/varnish/vcl/testdata/ingress_default_probe_dir.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 probe vk8s_tea-svc_probe {
 	.url = "/healthz";

pkg/varnish/vcl/testdata/ingress_default_rules.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 probe vk8s_coffee-svc_probe {
 	.request =

pkg/varnish/vcl/testdata/ingress_fanout_nohost.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_coffee-svc_192_0_2_4 {
 	.host = "192.0.2.4";

pkg/varnish/vcl/testdata/ingress_shard.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_coffee-svc_192_0_2_4 {
 	.host = "192.0.2.4";

pkg/varnish/vcl/testdata/ingress_single_svc.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_tea-svc_192_0_2_1 {
 	.host = "192.0.2.1";

pkg/varnish/vcl/testdata/ingress_vhost_nohost.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_coffee-svc_192_0_2_4 {
 	.host = "192.0.2.4";

pkg/varnish/vcl/testdata/ingressrule.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 backend vk8s_coffee-svc_192_0_2_4 {
 	.host = "192.0.2.4";

pkg/varnish/vcl/testdata/rewrite_auth_delete.golden

@@ -5,11 +5,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 
 

pkg/varnish/vcl/vcl_tmpl.go

@@ -40,11 +40,7 @@ import directors;
 import re2;
 import dynamic;
 
-backend vk8s_notfound {
-	# 192.0.2.0/24 reserved for docs & examples (RFC5737).
-	.host = "192.0.2.255";
-	.port = "80";
-}
+include "bogo_backend.vcl";
 
 {{- define "ProbeDef"}}
 {{- range $name, $svc := .}}