overload: remove runtime override for http/2 goaway (envoyproxy#16041)

Remove deprecated runtime override envoy.reloadable_features.overload_manager_disable_keepalive_drain_http2. Multiplexing HTTP connections (HTTP/2, HTTP/3) will always be sent a GOAWAY when the overload action for disabling connection keepalive triggers. Signed-off-by: Alex Konradi <[email protected]> Signed-off-by: Gokul Nair <[email protected]>
gokulnair · May 6, 2021 · 359363e · 359363e
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Showing 4 changed files with 6 additions and 27 deletions.
diff --git a/docs/root/version_history/current.rst b/docs/root/version_history/current.rst
@@ -25,6 +25,7 @@ Removed Config or Runtime
 -------------------------
 *Normally occurs at the end of the* :ref:`deprecation period <deprecated>`
 
+* http: removed `envoy.reloadable_features.overload_manager_disable_keepalive_drain_http2`; Envoy will now always send GOAWAY to HTTP2 downstreams when the :ref:`disable_keepalive <config_overload_manager_overload_actions>` overload action is active.
 * tls: removed `envoy.reloadable_features.tls_use_io_handle_bio` runtime guard and legacy code path.
 
 New Features

diff --git a/source/common/http/conn_manager_impl.cc b/source/common/http/conn_manager_impl.cc
@@ -1362,11 +1362,7 @@ void ConnectionManagerImpl::ActiveStream::encodeHeaders(ResponseHeaderMap& heade
       connection_manager_.random_generator_.bernoulli(
           connection_manager_.overload_disable_keepalive_ref_.value())) {
     ENVOY_STREAM_LOG(debug, "disabling keepalive due to envoy overload", *this);
-    if (connection_manager_.codec_->protocol() < Protocol::Http2 ||
-        Runtime::runtimeFeatureEnabled(
-            "envoy.reloadable_features.overload_manager_disable_keepalive_drain_http2")) {
-      drain_connection_due_to_overload = true;
-    }
+    drain_connection_due_to_overload = true;
     connection_manager_.stats_.named_.downstream_cx_overload_disable_keepalive_.inc();
   }
 

diff --git a/source/common/runtime/runtime_features.cc b/source/common/runtime/runtime_features.cc
@@ -80,7 +80,6 @@ constexpr const char* runtime_features[] = {
     "envoy.reloadable_features.http2_skip_encoding_empty_trailers",
     "envoy.reloadable_features.improved_stream_limit_handling",
     "envoy.reloadable_features.internal_redirects_with_body",
-    "envoy.reloadable_features.overload_manager_disable_keepalive_drain_http2",
     "envoy.reloadable_features.prefer_quic_kernel_bpf_packet_routing",
     "envoy.reloadable_features.preserve_downstream_scheme",
     "envoy.reloadable_features.remove_forked_chromium_url",

diff --git a/test/common/http/conn_manager_impl_test_2.cc b/test/common/http/conn_manager_impl_test_2.cc
@@ -2187,31 +2187,17 @@ TEST_F(HttpConnectionManagerImplTest, DisableHttp1KeepAliveWhenOverloaded) {
   EXPECT_EQ(1U, stats_.named_.downstream_cx_overload_disable_keepalive_.value());
 }
 
-class DrainH2HttpConnectionManagerImplTest : public HttpConnectionManagerImplTest,
-                                             public testing::WithParamInterface<bool> {
-public:
-  DrainH2HttpConnectionManagerImplTest() {
-    Runtime::LoaderSingleton::getExisting()->mergeValues(
-        {{"envoy.reloadable_features.overload_manager_disable_keepalive_drain_http2", "true"}});
-  }
-
-private:
-  TestScopedRuntime runtime_;
-};
-
-// Verify that, if the runtime option is enabled, HTTP2 connections will receive
-// a GOAWAY message when the overload action is triggered.
-TEST_P(DrainH2HttpConnectionManagerImplTest, DisableHttp2KeepAliveWhenOverloaded) {
+// Verify that HTTP2 connections will receive a GOAWAY message when the overload action is
+// triggered.
+TEST_F(HttpConnectionManagerImplTest, DisableHttp2KeepAliveWhenOverloaded) {
   Server::OverloadActionState disable_http_keep_alive = Server::OverloadActionState::saturated();
   ON_CALL(overload_manager_.overload_state_,
           getState(Server::OverloadActionNames::get().DisableHttpKeepAlive))
       .WillByDefault(ReturnRef(disable_http_keep_alive));
 
   codec_->protocol_ = Protocol::Http2;
   setup(false, "");
-  if (GetParam()) {
-    EXPECT_CALL(*codec_, shutdownNotice);
-  }
+  EXPECT_CALL(*codec_, shutdownNotice);
 
   std::shared_ptr<MockStreamDecoderFilter> filter(new NiceMock<MockStreamDecoderFilter>());
   EXPECT_CALL(filter_factory_, createFilterChain(_))
@@ -2244,9 +2230,6 @@ TEST_P(DrainH2HttpConnectionManagerImplTest, DisableHttp2KeepAliveWhenOverloaded
   EXPECT_EQ(1, stats_.named_.downstream_cx_overload_disable_keepalive_.value());
 }
 
-INSTANTIATE_TEST_SUITE_P(WithRuntimeOverride, DrainH2HttpConnectionManagerImplTest,
-                         testing::Bool());
-
 TEST_F(HttpConnectionManagerImplTest, TestStopAllIterationAndBufferOnDecodingPathFirstFilter) {
   setup(false, "envoy-custom-server", false);
   setUpEncoderAndDecoder(true, true);