http health check: configurable expected HTTP response codes (#5901)

Signed-off-by: Bartosz Borkowski <bartebor@wp.pl>

Mirrored from https://github.com/envoyproxy/envoy @ 1109a4c87eb4d47643ddb433890c663a651b739e

envoy/api/v2/core/BUILD

@@ -54,13 +54,19 @@ api_proto_library_internal(
     visibility = [
         ":friends",
     ],
-    deps = [":base"],
+    deps = [
+        ":base",
+        "//envoy/type:range",
+    ],
 )
 
 api_go_proto_library(
     name = "health_check",
     proto = ":health_check",
-    deps = [":base_go_proto"],
+    deps = [
+        ":base_go_proto",
+        "//envoy/type:range_go_proto",
+    ],
 )
 
 api_proto_library_internal(

envoy/api/v2/core/health_check.proto

@@ -7,6 +7,7 @@ option java_multiple_files = true;
 option java_package = "io.envoyproxy.envoy.api.v2.core";
 
 import "envoy/api/v2/core/base.proto";
+import "envoy/type/range.proto";
 
 import "google/protobuf/any.proto";
 import "google/protobuf/duration.proto";
@@ -84,7 +85,7 @@ message HealthCheck {
     }
   }
 
-  // [#comment:next free field: 9]
+  // [#comment:next free field: 10]
   message HttpHealthCheck {
     // The value of the host header in the HTTP health check request. If
     // left empty (default value), the name of the cluster this health check is associated
@@ -119,6 +120,11 @@ message HealthCheck {
 
     // If set, health checks will be made using http/2.
     bool use_http2 = 7;
+
+    // Specifies a list of HTTP response statuses considered healthy. If provided, replaces default
+    // 200-only policy - 200 must be included explicitly as needed. Ranges follow half-open
+    // semantics of :ref:`Int64Range <envoy_api_msg_type.Int64Range>`.
+    repeated envoy.type.Int64Range expected_statuses = 9;
   }
 
   message TcpHealthCheck {