release: flipping deprecated features to fatal-by-default (#6509)

Making the following deprecated fields fatal-by-default
UNSUPPORTED_REST_LEGACY from config_source.proto
use_alpha from ext_authz.proto
enabled from route.proto
type from fault.proto
runtime_key from route.proto

Risk Level: High (first time using this process - it will likely cause problems for someone)
Testing: tests pass.
Docs Changes: n/a
Release Notes: no

Signed-off-by: Alyssa Wilk <alyssar@chromium.org>

api/envoy/config/filter/network/tcp_proxy/v2/tcp_proxy.proto

@@ -172,7 +172,8 @@ message TcpProxy {
   //   list of strings with each string in CIDR notation. Source and destination ports are
   //   specified as single strings containing a comma-separated list of ports and/or port ranges.
   //
-  DeprecatedV1 deprecated_v1 = 6 [deprecated = true];
+  // Deprecation pending https://github.com/envoyproxy/envoy/issues/4457
+  DeprecatedV1 deprecated_v1 = 6;
 
   // The maximum number of unsuccessful connection attempts that will be made before
   // giving up. If the parameter is not specified, 1 connection attempt will be made.

source/common/runtime/runtime_features.cc

@@ -47,6 +47,11 @@ constexpr const char* disallowed_features[] = {
     // Acts as both a test entry for deprecated.proto and a marker for the Envoy
     // deprecation scripts.
     "envoy.deprecated_features.deprecated.proto:is_deprecated_fatal",
+    "envoy.deprecated_features.config_source.proto:UNSUPPORTED_REST_LEGACY",
+    "envoy.deprecated_features.ext_authz.proto:use_alpha",
+    "envoy.deprecated_features.route.proto:enabled",
+    "envoy.deprecated_features.fault.proto:type",
+    "envoy.deprecated_features.route.proto:runtime_key",
 };
 
 RuntimeFeatures::RuntimeFeatures() {