From d852363a9e4f21803e795d6737a37f220d3162c0 Mon Sep 17 00:00:00 2001
From: "data-plane-api(Azure Pipelines)"
 <data-plane-api@users.noreply.github.com>
Date: Tue, 18 Oct 2022 19:43:08 +0000
Subject: [PATCH] api: add attention to HeaderValueOption.append to avoid
 removing this field (#23518)

Signed-off-by: wbpcode <wangbaiping@corp.netease.com>

Mirrored from https://github.com/envoyproxy/envoy @ a3ac3e4d6bbebaf3e107f526ae0857020f98d963
---
 envoy/config/core/v3/base.proto | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/envoy/config/core/v3/base.proto b/envoy/config/core/v3/base.proto
index 52a3b8a2..383b3d96 100644
--- a/envoy/config/core/v3/base.proto
+++ b/envoy/config/core/v3/base.proto
@@ -358,6 +358,11 @@ message HeaderValueOption {
   // existing values. Otherwise it replaces any existing values.
   // This field is deprecated and please use
   // :ref:`append_action <envoy_v3_api_field_config.core.v3.HeaderValueOption.append_action>` as replacement.
+  //
+  // .. note::
+  //   The :ref:`external authorization service <envoy_v3_api_msg_service.auth.v3.CheckResponse>` and
+  //   :ref:`external processor service <envoy_v3_api_msg_service.ext_proc.v3.ProcessingResponse>` have
+  //   default value (``false``) for this field.
   google.protobuf.BoolValue append = 2
       [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];