udp_proxy: support file access logging (#20103)

Signed-off-by: giantcroc <changran.wang@intel.com>

Mirrored from https://github.com/envoyproxy/envoy @ 4dc78ded31fb64f5790553bd67e4f3bc9d13998e

envoy/extensions/filters/udp/udp_proxy/v3/BUILD

@@ -6,6 +6,7 @@ licenses(["notice"])  # Apache 2
 
 api_proto_package(
     deps = [
+        "//envoy/config/accesslog/v3:pkg",
         "//envoy/config/core/v3:pkg",
         "@com_github_cncf_udpa//udpa/annotations:pkg",
     ],

envoy/extensions/filters/udp/udp_proxy/v3/udp_proxy.proto

@@ -2,6 +2,7 @@ syntax = "proto3";
 
 package envoy.extensions.filters.udp.udp_proxy.v3;
 
+import "envoy/config/accesslog/v3/accesslog.proto";
 import "envoy/config/core/v3/udp_socket_config.proto";
 
 import "google/protobuf/duration.proto";
@@ -21,7 +22,7 @@ option (udpa.annotations.file_status).package_version_status = ACTIVE;
 // [#extension: envoy.filters.udp_listener.udp_proxy]
 
 // Configuration for the UDP proxy filter.
-// [#next-free-field: 8]
+// [#next-free-field: 9]
 message UdpProxyConfig {
   option (udpa.annotations.versioning).previous_message_type =
       "envoy.config.filter.udp.udp_proxy.v2alpha.UdpProxyConfig";
@@ -88,4 +89,7 @@ message UdpProxyConfig {
   // The default if not specified is false, that means each data chunk is forwarded
   // to upstream host selected on first chunk receival for that "session" (identified by source IP/port and local IP/port).
   bool use_per_packet_load_balancing = 7;
+
+  // Configuration for access logs emitted by the UDP proxy. Note that certain UDP specific data is emitted as :ref:`Dynamic Metadata <config_access_log_format_dynamic_metadata>`.
+  repeated config.accesslog.v3.AccessLog access_log = 8;
 }