diff --git a/BUILD b/BUILD
index 5dd9ed6b08d..65fc7115dc7 100644
--- a/BUILD
+++ b/BUILD
@@ -570,12 +570,15 @@ grpc_cc_library(
         "//src/core:channel_args",
         "//src/core:channel_init",
         "//src/core:channel_stack_type",
+        "//src/core:client_channel_backup_poller",
         "//src/core:default_event_engine",
         "//src/core:experiments",
         "//src/core:forkable",
         "//src/core:grpc_authorization_base",
+        "//src/core:http_proxy_mapper",
         "//src/core:init_internally",
         "//src/core:posix_event_engine_timer_manager",
+        "//src/core:service_config_channel_arg_filter",
         "//src/core:slice",
         "//src/core:tcp_connect_handshaker",
     ],
@@ -652,6 +655,7 @@ grpc_cc_library(
         "//src/core:channel_args",
         "//src/core:channel_init",
         "//src/core:channel_stack_type",
+        "//src/core:client_channel_backup_poller",
         "//src/core:default_event_engine",
         "//src/core:experiments",
         "//src/core:forkable",
@@ -666,11 +670,13 @@ grpc_cc_library(
         "//src/core:grpc_ssl_credentials",
         "//src/core:grpc_tls_credentials",
         "//src/core:grpc_transport_chttp2_alpn",
+        "//src/core:http_proxy_mapper",
         "//src/core:httpcli_ssl_credentials",
         "//src/core:init_internally",
         "//src/core:json",
         "//src/core:posix_event_engine_timer_manager",
         "//src/core:ref_counted",
+        "//src/core:service_config_channel_arg_filter",
         "//src/core:slice",
         "//src/core:slice_refcount",
         "//src/core:tcp_connect_handshaker",
@@ -1120,6 +1126,7 @@ grpc_cc_library(
         "//src/core:slice",
         "//src/core:slice_refcount",
         "//src/core:status_helper",
+        "//src/core:subchannel_connector",
         "//src/core:transport_fwd",
     ],
 )
@@ -3228,57 +3235,107 @@ grpc_cc_library(
 )
 
 grpc_cc_library(
-    name = "grpc_client_channel",
+    name = "oob_backend_metric",
     srcs = [
-        "//src/core:client_channel/backend_metric.cc",
-        "//src/core:client_channel/backup_poller.cc",
-        "//src/core:client_channel/channel_connectivity.cc",
-        "//src/core:client_channel/client_channel_channelz.cc",
-        "//src/core:client_channel/client_channel_factory.cc",
-        "//src/core:client_channel/client_channel_filter.cc",
-        "//src/core:client_channel/client_channel_plugin.cc",
-        "//src/core:client_channel/client_channel_service_config.cc",
-        "//src/core:client_channel/config_selector.cc",
-        "//src/core:client_channel/dynamic_filters.cc",
-        "//src/core:client_channel/global_subchannel_pool.cc",
-        "//src/core:client_channel/http_proxy_mapper.cc",
-        "//src/core:client_channel/local_subchannel_pool.cc",
-        "//src/core:client_channel/retry_filter.cc",
-        "//src/core:client_channel/retry_filter_legacy_call_data.cc",
-        "//src/core:client_channel/retry_service_config.cc",
-        "//src/core:client_channel/retry_throttle.cc",
-        "//src/core:client_channel/service_config_channel_arg_filter.cc",
-        "//src/core:client_channel/subchannel.cc",
-        "//src/core:client_channel/subchannel_pool_interface.cc",
-        "//src/core:client_channel/subchannel_stream_client.cc",
-        "//src/core:load_balancing/child_policy_handler.cc",
         "//src/core:load_balancing/oob_backend_metric.cc",
     ],
     hdrs = [
-        "//src/core:client_channel/backend_metric.h",
-        "//src/core:client_channel/backup_poller.h",
-        "//src/core:client_channel/client_channel_channelz.h",
+        "//src/core:load_balancing/oob_backend_metric.h",
+        "//src/core:load_balancing/oob_backend_metric_internal.h",
+    ],
+    external_deps = [
+        "absl/base:core_headers",
+        "absl/status",
+        "absl/strings",
+        "upb_base_lib",
+        "upb_mem_lib",
+    ],
+    language = "c++",
+    deps = [
+        "channelz",
+        "debug_location",
+        "exec_ctx",
+        "gpr",
+        "grpc_client_channel",
+        "grpc_public_hdrs",
+        "grpc_trace",
+        "orphanable",
+        "protobuf_duration_upb",
+        "ref_counted_ptr",
+        "xds_orca_service_upb",
+        "xds_orca_upb",
+        "//src/core:backend_metric_parser",
+        "//src/core:client_channel_channelz",
+        "//src/core:closure",
+        "//src/core:error",
+        "//src/core:grpc_backend_metric_data",
+        "//src/core:iomgr_fwd",
+        "//src/core:pollset_set",
+        "//src/core:slice",
+        "//src/core:subchannel_interface",
+        "//src/core:time",
+        "//src/core:unique_type_name",
+    ],
+)
+
+grpc_cc_library(
+    name = "lb_child_policy_handler",
+    srcs = [
+        "//src/core:load_balancing/child_policy_handler.cc",
+    ],
+    hdrs = [
+        "//src/core:load_balancing/child_policy_handler.h",
+    ],
+    external_deps = [
+        "absl/status",
+        "absl/strings",
+    ],
+    language = "c++",
+    deps = [
+        "config",
+        "debug_location",
+        "gpr_public_hdrs",
+        "grpc_public_hdrs",
+        "grpc_trace",
+        "orphanable",
+        "ref_counted_ptr",
+        "//src/core:channel_args",
+        "//src/core:connectivity_state",
+        "//src/core:delegating_helper",
+        "//src/core:lb_policy",
+        "//src/core:lb_policy_registry",
+        "//src/core:pollset_set",
+        "//src/core:resolved_address",
+        "//src/core:subchannel_interface",
+    ],
+)
+
+grpc_cc_library(
+    name = "grpc_client_channel",
+    srcs = [
+        "//src/core:client_channel/channel_connectivity.cc",
+        "//src/core:client_channel/client_channel_factory.cc",
+        "//src/core:client_channel/client_channel_filter.cc",
+        "//src/core:client_channel/client_channel_plugin.cc",
+        "//src/core:client_channel/dynamic_filters.cc",
+        "//src/core:client_channel/global_subchannel_pool.cc",
+        "//src/core:client_channel/local_subchannel_pool.cc",
+        "//src/core:client_channel/retry_filter.cc",
+        "//src/core:client_channel/retry_filter_legacy_call_data.cc",
+        "//src/core:client_channel/subchannel.cc",
+        "//src/core:client_channel/subchannel_stream_client.cc",
+    ],
+    hdrs = [
         "//src/core:client_channel/client_channel_factory.h",
         "//src/core:client_channel/client_channel_filter.h",
-        "//src/core:client_channel/client_channel_internal.h",
-        "//src/core:client_channel/client_channel_service_config.h",
-        "//src/core:client_channel/config_selector.h",
-        "//src/core:client_channel/connector.h",
         "//src/core:client_channel/dynamic_filters.h",
         "//src/core:client_channel/global_subchannel_pool.h",
-        "//src/core:client_channel/http_proxy_mapper.h",
         "//src/core:client_channel/local_subchannel_pool.h",
         "//src/core:client_channel/retry_filter.h",
         "//src/core:client_channel/retry_filter_legacy_call_data.h",
-        "//src/core:client_channel/retry_service_config.h",
-        "//src/core:client_channel/retry_throttle.h",
         "//src/core:client_channel/subchannel.h",
         "//src/core:client_channel/subchannel_interface_internal.h",
-        "//src/core:client_channel/subchannel_pool_interface.h",
         "//src/core:client_channel/subchannel_stream_client.h",
-        "//src/core:load_balancing/child_policy_handler.h",
-        "//src/core:load_balancing/oob_backend_metric.h",
-        "//src/core:load_balancing/oob_backend_metric_internal.h",
     ],
     external_deps = [
         "absl/base:core_headers",
@@ -3318,6 +3375,7 @@ grpc_cc_library(
         "http_connect_handshaker",
         "iomgr",
         "iomgr_timer",
+        "lb_child_policy_handler",
         "legacy_context",
         "orphanable",
         "parse_address",
@@ -3333,12 +3391,18 @@ grpc_cc_library(
         "//src/core:activity",
         "//src/core:arena",
         "//src/core:arena_promise",
+        "//src/core:backend_metric_parser",
         "//src/core:cancel_callback",
         "//src/core:channel_args",
         "//src/core:channel_fwd",
         "//src/core:channel_init",
         "//src/core:channel_stack_type",
+        "//src/core:client_channel_backup_poller",
+        "//src/core:client_channel_channelz",
+        "//src/core:client_channel_internal_header",
+        "//src/core:client_channel_service_config",
         "//src/core:closure",
+        "//src/core:config_selector",
         "//src/core:connectivity_state",
         "//src/core:construct_destruct",
         "//src/core:context",
@@ -3374,6 +3438,8 @@ grpc_cc_library(
         "//src/core:ref_counted",
         "//src/core:resolved_address",
         "//src/core:resource_quota",
+        "//src/core:retry_service_config",
+        "//src/core:retry_throttle",
         "//src/core:seq",
         "//src/core:service_config_parser",
         "//src/core:slice",
@@ -3381,7 +3447,9 @@ grpc_cc_library(
         "//src/core:slice_refcount",
         "//src/core:stats_data",
         "//src/core:status_helper",
+        "//src/core:subchannel_connector",
         "//src/core:subchannel_interface",
+        "//src/core:subchannel_pool_interface",
         "//src/core:time",
         "//src/core:try_seq",
         "//src/core:unique_type_name",
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8fd0a8bd0ad..d000e6df5ec 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1776,7 +1776,6 @@ endif()
 
 
 add_library(grpc
-  src/core/client_channel/backend_metric.cc
   src/core/client_channel/backup_poller.cc
   src/core/client_channel/channel_connectivity.cc
   src/core/client_channel/client_channel_channelz.cc
@@ -1793,7 +1792,6 @@ add_library(grpc
   src/core/client_channel/retry_filter_legacy_call_data.cc
   src/core/client_channel/retry_service_config.cc
   src/core/client_channel/retry_throttle.cc
-  src/core/client_channel/service_config_channel_arg_filter.cc
   src/core/client_channel/subchannel.cc
   src/core/client_channel/subchannel_pool_interface.cc
   src/core/client_channel/subchannel_stream_client.cc
@@ -2496,6 +2494,7 @@ add_library(grpc
   src/core/lib/transport/transport_op_string.cc
   src/core/lib/uri/uri_parser.cc
   src/core/load_balancing/address_filtering.cc
+  src/core/load_balancing/backend_metric_parser.cc
   src/core/load_balancing/child_policy_handler.cc
   src/core/load_balancing/endpoint_list.cc
   src/core/load_balancing/grpclb/client_load_reporting_filter.cc
@@ -2544,6 +2543,7 @@ add_library(grpc
   src/core/resolver/xds/xds_dependency_manager.cc
   src/core/resolver/xds/xds_resolver.cc
   src/core/resolver/xds/xds_resolver_trace.cc
+  src/core/service_config/service_config_channel_arg_filter.cc
   src/core/service_config/service_config_impl.cc
   src/core/service_config/service_config_parser.cc
   src/core/tsi/alts/crypt/aes_gcm.cc
@@ -2873,7 +2873,6 @@ endif()
 
 
 add_library(grpc_unsecure
-  src/core/client_channel/backend_metric.cc
   src/core/client_channel/backup_poller.cc
   src/core/client_channel/channel_connectivity.cc
   src/core/client_channel/client_channel_channelz.cc
@@ -2890,7 +2889,6 @@ add_library(grpc_unsecure
   src/core/client_channel/retry_filter_legacy_call_data.cc
   src/core/client_channel/retry_service_config.cc
   src/core/client_channel/retry_throttle.cc
-  src/core/client_channel/service_config_channel_arg_filter.cc
   src/core/client_channel/subchannel.cc
   src/core/client_channel/subchannel_pool_interface.cc
   src/core/client_channel/subchannel_stream_client.cc
@@ -3223,6 +3221,7 @@ add_library(grpc_unsecure
   src/core/lib/transport/transport_op_string.cc
   src/core/lib/uri/uri_parser.cc
   src/core/load_balancing/address_filtering.cc
+  src/core/load_balancing/backend_metric_parser.cc
   src/core/load_balancing/child_policy_handler.cc
   src/core/load_balancing/endpoint_list.cc
   src/core/load_balancing/grpclb/client_load_reporting_filter.cc
@@ -3261,6 +3260,7 @@ add_library(grpc_unsecure
   src/core/resolver/resolver.cc
   src/core/resolver/resolver_registry.cc
   src/core/resolver/sockaddr/sockaddr_resolver.cc
+  src/core/service_config/service_config_channel_arg_filter.cc
   src/core/service_config/service_config_impl.cc
   src/core/service_config/service_config_parser.cc
   src/core/tsi/alts/handshaker/transport_security_common_api.cc
diff --git a/Makefile b/Makefile
index ea17f927d42..3b327e73096 100644
--- a/Makefile
+++ b/Makefile
@@ -958,7 +958,6 @@ endif
 # deps: ['upb_json_lib', 'upb_textformat_lib', 're2', 'z', 'grpc_abseil', 'cares', 'gpr', 'libssl', 'address_sorting']
 # transitive_deps: ['address_sorting', 'gpr', 'grpc_abseil', 'cares', 'z', 're2', 'upb_textformat_lib', 'upb_json_lib', 'utf8_range_lib', 'upb_message_lib', 'upb_mem_lib', 'upb_base_lib', 'libssl']
 LIBGRPC_SRC = \
-    src/core/client_channel/backend_metric.cc \
     src/core/client_channel/backup_poller.cc \
     src/core/client_channel/channel_connectivity.cc \
     src/core/client_channel/client_channel_channelz.cc \
@@ -975,7 +974,6 @@ LIBGRPC_SRC = \
     src/core/client_channel/retry_filter_legacy_call_data.cc \
     src/core/client_channel/retry_service_config.cc \
     src/core/client_channel/retry_throttle.cc \
-    src/core/client_channel/service_config_channel_arg_filter.cc \
     src/core/client_channel/subchannel.cc \
     src/core/client_channel/subchannel_pool_interface.cc \
     src/core/client_channel/subchannel_stream_client.cc \
@@ -1678,6 +1676,7 @@ LIBGRPC_SRC = \
     src/core/lib/transport/transport_op_string.cc \
     src/core/lib/uri/uri_parser.cc \
     src/core/load_balancing/address_filtering.cc \
+    src/core/load_balancing/backend_metric_parser.cc \
     src/core/load_balancing/child_policy_handler.cc \
     src/core/load_balancing/endpoint_list.cc \
     src/core/load_balancing/grpclb/client_load_reporting_filter.cc \
@@ -1726,6 +1725,7 @@ LIBGRPC_SRC = \
     src/core/resolver/xds/xds_dependency_manager.cc \
     src/core/resolver/xds/xds_resolver.cc \
     src/core/resolver/xds/xds_resolver_trace.cc \
+    src/core/service_config/service_config_channel_arg_filter.cc \
     src/core/service_config/service_config_impl.cc \
     src/core/service_config/service_config_parser.cc \
     src/core/tsi/alts/crypt/aes_gcm.cc \
@@ -1889,7 +1889,6 @@ endif
 # deps: ['upb_message_lib', 'utf8_range_lib', 'z', 'grpc_abseil', 'cares', 'gpr', 'address_sorting']
 # transitive_deps: ['address_sorting', 'gpr', 'grpc_abseil', 'cares', 'z', 'utf8_range_lib', 'upb_message_lib', 'upb_mem_lib', 'upb_base_lib']
 LIBGRPC_UNSECURE_SRC = \
-    src/core/client_channel/backend_metric.cc \
     src/core/client_channel/backup_poller.cc \
     src/core/client_channel/channel_connectivity.cc \
     src/core/client_channel/client_channel_channelz.cc \
@@ -1906,7 +1905,6 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/client_channel/retry_filter_legacy_call_data.cc \
     src/core/client_channel/retry_service_config.cc \
     src/core/client_channel/retry_throttle.cc \
-    src/core/client_channel/service_config_channel_arg_filter.cc \
     src/core/client_channel/subchannel.cc \
     src/core/client_channel/subchannel_pool_interface.cc \
     src/core/client_channel/subchannel_stream_client.cc \
@@ -2239,6 +2237,7 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/lib/transport/transport_op_string.cc \
     src/core/lib/uri/uri_parser.cc \
     src/core/load_balancing/address_filtering.cc \
+    src/core/load_balancing/backend_metric_parser.cc \
     src/core/load_balancing/child_policy_handler.cc \
     src/core/load_balancing/endpoint_list.cc \
     src/core/load_balancing/grpclb/client_load_reporting_filter.cc \
@@ -2277,6 +2276,7 @@ LIBGRPC_UNSECURE_SRC = \
     src/core/resolver/resolver.cc \
     src/core/resolver/resolver_registry.cc \
     src/core/resolver/sockaddr/sockaddr_resolver.cc \
+    src/core/service_config/service_config_channel_arg_filter.cc \
     src/core/service_config/service_config_impl.cc \
     src/core/service_config/service_config_parser.cc \
     src/core/tsi/alts/handshaker/transport_security_common_api.cc \
diff --git a/Package.swift b/Package.swift
index 2eef1c50f8f..2f056910c40 100644
--- a/Package.swift
+++ b/Package.swift
@@ -115,8 +115,6 @@ let package = Package(
         "include/grpc/support/thd_id.h",
         "include/grpc/support/time.h",
         "include/grpc/support/workaround_list.h",
-        "src/core/client_channel/backend_metric.cc",
-        "src/core/client_channel/backend_metric.h",
         "src/core/client_channel/backup_poller.cc",
         "src/core/client_channel/backup_poller.h",
         "src/core/client_channel/channel_connectivity.cc",
@@ -149,7 +147,6 @@ let package = Package(
         "src/core/client_channel/retry_service_config.h",
         "src/core/client_channel/retry_throttle.cc",
         "src/core/client_channel/retry_throttle.h",
-        "src/core/client_channel/service_config_channel_arg_filter.cc",
         "src/core/client_channel/subchannel.cc",
         "src/core/client_channel/subchannel.h",
         "src/core/client_channel/subchannel_interface_internal.h",
@@ -1849,6 +1846,8 @@ let package = Package(
         "src/core/load_balancing/address_filtering.cc",
         "src/core/load_balancing/address_filtering.h",
         "src/core/load_balancing/backend_metric_data.h",
+        "src/core/load_balancing/backend_metric_parser.cc",
+        "src/core/load_balancing/backend_metric_parser.h",
         "src/core/load_balancing/child_policy_handler.cc",
         "src/core/load_balancing/child_policy_handler.h",
         "src/core/load_balancing/delegating_helper.h",
@@ -1939,6 +1938,7 @@ let package = Package(
         "src/core/resolver/xds/xds_resolver_trace.h",
         "src/core/service_config/service_config.h",
         "src/core/service_config/service_config_call_data.h",
+        "src/core/service_config/service_config_channel_arg_filter.cc",
         "src/core/service_config/service_config_impl.cc",
         "src/core/service_config/service_config_impl.h",
         "src/core/service_config/service_config_parser.cc",
diff --git a/build_autogenerated.yaml b/build_autogenerated.yaml
index dcddc032e00..aec39d0727f 100644
--- a/build_autogenerated.yaml
+++ b/build_autogenerated.yaml
@@ -216,7 +216,6 @@ libs:
   - include/grpc/support/time.h
   - include/grpc/support/workaround_list.h
   headers:
-  - src/core/client_channel/backend_metric.h
   - src/core/client_channel/backup_poller.h
   - src/core/client_channel/client_channel_channelz.h
   - src/core/client_channel/client_channel_factory.h
@@ -1156,6 +1155,7 @@ libs:
   - src/core/lib/uri/uri_parser.h
   - src/core/load_balancing/address_filtering.h
   - src/core/load_balancing/backend_metric_data.h
+  - src/core/load_balancing/backend_metric_parser.h
   - src/core/load_balancing/child_policy_handler.h
   - src/core/load_balancing/delegating_helper.h
   - src/core/load_balancing/endpoint_list.h
@@ -1232,7 +1232,6 @@ libs:
   - third_party/upb/upb/generated_code_support.h
   - third_party/xxhash/xxhash.h
   src:
-  - src/core/client_channel/backend_metric.cc
   - src/core/client_channel/backup_poller.cc
   - src/core/client_channel/channel_connectivity.cc
   - src/core/client_channel/client_channel_channelz.cc
@@ -1249,7 +1248,6 @@ libs:
   - src/core/client_channel/retry_filter_legacy_call_data.cc
   - src/core/client_channel/retry_service_config.cc
   - src/core/client_channel/retry_throttle.cc
-  - src/core/client_channel/service_config_channel_arg_filter.cc
   - src/core/client_channel/subchannel.cc
   - src/core/client_channel/subchannel_pool_interface.cc
   - src/core/client_channel/subchannel_stream_client.cc
@@ -1952,6 +1950,7 @@ libs:
   - src/core/lib/transport/transport_op_string.cc
   - src/core/lib/uri/uri_parser.cc
   - src/core/load_balancing/address_filtering.cc
+  - src/core/load_balancing/backend_metric_parser.cc
   - src/core/load_balancing/child_policy_handler.cc
   - src/core/load_balancing/endpoint_list.cc
   - src/core/load_balancing/grpclb/client_load_reporting_filter.cc
@@ -2000,6 +1999,7 @@ libs:
   - src/core/resolver/xds/xds_dependency_manager.cc
   - src/core/resolver/xds/xds_resolver.cc
   - src/core/resolver/xds/xds_resolver_trace.cc
+  - src/core/service_config/service_config_channel_arg_filter.cc
   - src/core/service_config/service_config_impl.cc
   - src/core/service_config/service_config_parser.cc
   - src/core/tsi/alts/crypt/aes_gcm.cc
@@ -2193,7 +2193,6 @@ libs:
   - include/grpc/support/time.h
   - include/grpc/support/workaround_list.h
   headers:
-  - src/core/client_channel/backend_metric.h
   - src/core/client_channel/backup_poller.h
   - src/core/client_channel/client_channel_channelz.h
   - src/core/client_channel/client_channel_factory.h
@@ -2615,6 +2614,7 @@ libs:
   - src/core/lib/uri/uri_parser.h
   - src/core/load_balancing/address_filtering.h
   - src/core/load_balancing/backend_metric_data.h
+  - src/core/load_balancing/backend_metric_parser.h
   - src/core/load_balancing/child_policy_handler.h
   - src/core/load_balancing/delegating_helper.h
   - src/core/load_balancing/endpoint_list.h
@@ -2681,7 +2681,6 @@ libs:
   - third_party/upb/upb/wire/reader.h
   - third_party/upb/upb/wire/types.h
   src:
-  - src/core/client_channel/backend_metric.cc
   - src/core/client_channel/backup_poller.cc
   - src/core/client_channel/channel_connectivity.cc
   - src/core/client_channel/client_channel_channelz.cc
@@ -2698,7 +2697,6 @@ libs:
   - src/core/client_channel/retry_filter_legacy_call_data.cc
   - src/core/client_channel/retry_service_config.cc
   - src/core/client_channel/retry_throttle.cc
-  - src/core/client_channel/service_config_channel_arg_filter.cc
   - src/core/client_channel/subchannel.cc
   - src/core/client_channel/subchannel_pool_interface.cc
   - src/core/client_channel/subchannel_stream_client.cc
@@ -3031,6 +3029,7 @@ libs:
   - src/core/lib/transport/transport_op_string.cc
   - src/core/lib/uri/uri_parser.cc
   - src/core/load_balancing/address_filtering.cc
+  - src/core/load_balancing/backend_metric_parser.cc
   - src/core/load_balancing/child_policy_handler.cc
   - src/core/load_balancing/endpoint_list.cc
   - src/core/load_balancing/grpclb/client_load_reporting_filter.cc
@@ -3069,6 +3068,7 @@ libs:
   - src/core/resolver/resolver.cc
   - src/core/resolver/resolver_registry.cc
   - src/core/resolver/sockaddr/sockaddr_resolver.cc
+  - src/core/service_config/service_config_channel_arg_filter.cc
   - src/core/service_config/service_config_impl.cc
   - src/core/service_config/service_config_parser.cc
   - src/core/tsi/alts/handshaker/transport_security_common_api.cc
diff --git a/config.m4 b/config.m4
index 58288e0696e..1dbc1b1e324 100644
--- a/config.m4
+++ b/config.m4
@@ -41,7 +41,6 @@ if test "$PHP_GRPC" != "no"; then
   PHP_SUBST(GRPC_SHARED_LIBADD)
 
   PHP_NEW_EXTENSION(grpc,
-    src/core/client_channel/backend_metric.cc \
     src/core/client_channel/backup_poller.cc \
     src/core/client_channel/channel_connectivity.cc \
     src/core/client_channel/client_channel_channelz.cc \
@@ -58,7 +57,6 @@ if test "$PHP_GRPC" != "no"; then
     src/core/client_channel/retry_filter_legacy_call_data.cc \
     src/core/client_channel/retry_service_config.cc \
     src/core/client_channel/retry_throttle.cc \
-    src/core/client_channel/service_config_channel_arg_filter.cc \
     src/core/client_channel/subchannel.cc \
     src/core/client_channel/subchannel_pool_interface.cc \
     src/core/client_channel/subchannel_stream_client.cc \
@@ -806,6 +804,7 @@ if test "$PHP_GRPC" != "no"; then
     src/core/lib/transport/transport_op_string.cc \
     src/core/lib/uri/uri_parser.cc \
     src/core/load_balancing/address_filtering.cc \
+    src/core/load_balancing/backend_metric_parser.cc \
     src/core/load_balancing/child_policy_handler.cc \
     src/core/load_balancing/endpoint_list.cc \
     src/core/load_balancing/grpclb/client_load_reporting_filter.cc \
@@ -854,6 +853,7 @@ if test "$PHP_GRPC" != "no"; then
     src/core/resolver/xds/xds_dependency_manager.cc \
     src/core/resolver/xds/xds_resolver.cc \
     src/core/resolver/xds/xds_resolver_trace.cc \
+    src/core/service_config/service_config_channel_arg_filter.cc \
     src/core/service_config/service_config_impl.cc \
     src/core/service_config/service_config_parser.cc \
     src/core/tsi/alts/crypt/aes_gcm.cc \
diff --git a/config.w32 b/config.w32
index 95c28ce6b99..18f0c8e8725 100644
--- a/config.w32
+++ b/config.w32
@@ -6,7 +6,6 @@ ARG_WITH("grpc", "grpc support", "no");
 if (PHP_GRPC != "no") {
 
   EXTENSION("grpc",
-    "src\\core\\client_channel\\backend_metric.cc " +
     "src\\core\\client_channel\\backup_poller.cc " +
     "src\\core\\client_channel\\channel_connectivity.cc " +
     "src\\core\\client_channel\\client_channel_channelz.cc " +
@@ -23,7 +22,6 @@ if (PHP_GRPC != "no") {
     "src\\core\\client_channel\\retry_filter_legacy_call_data.cc " +
     "src\\core\\client_channel\\retry_service_config.cc " +
     "src\\core\\client_channel\\retry_throttle.cc " +
-    "src\\core\\client_channel\\service_config_channel_arg_filter.cc " +
     "src\\core\\client_channel\\subchannel.cc " +
     "src\\core\\client_channel\\subchannel_pool_interface.cc " +
     "src\\core\\client_channel\\subchannel_stream_client.cc " +
@@ -771,6 +769,7 @@ if (PHP_GRPC != "no") {
     "src\\core\\lib\\transport\\transport_op_string.cc " +
     "src\\core\\lib\\uri\\uri_parser.cc " +
     "src\\core\\load_balancing\\address_filtering.cc " +
+    "src\\core\\load_balancing\\backend_metric_parser.cc " +
     "src\\core\\load_balancing\\child_policy_handler.cc " +
     "src\\core\\load_balancing\\endpoint_list.cc " +
     "src\\core\\load_balancing\\grpclb\\client_load_reporting_filter.cc " +
@@ -819,6 +818,7 @@ if (PHP_GRPC != "no") {
     "src\\core\\resolver\\xds\\xds_dependency_manager.cc " +
     "src\\core\\resolver\\xds\\xds_resolver.cc " +
     "src\\core\\resolver\\xds\\xds_resolver_trace.cc " +
+    "src\\core\\service_config\\service_config_channel_arg_filter.cc " +
     "src\\core\\service_config\\service_config_impl.cc " +
     "src\\core\\service_config\\service_config_parser.cc " +
     "src\\core\\tsi\\alts\\crypt\\aes_gcm.cc " +
diff --git a/gRPC-C++.podspec b/gRPC-C++.podspec
index 46b13b49118..939670687e5 100644
--- a/gRPC-C++.podspec
+++ b/gRPC-C++.podspec
@@ -257,8 +257,7 @@ Pod::Spec.new do |s|
     ss.dependency 'abseil/types/variant', abseil_version
     ss.dependency 'abseil/utility/utility', abseil_version
 
-    ss.source_files = 'src/core/client_channel/backend_metric.h',
-                      'src/core/client_channel/backup_poller.h',
+    ss.source_files = 'src/core/client_channel/backup_poller.h',
                       'src/core/client_channel/client_channel_channelz.h',
                       'src/core/client_channel/client_channel_factory.h',
                       'src/core/client_channel/client_channel_filter.h',
@@ -1261,6 +1260,7 @@ Pod::Spec.new do |s|
                       'src/core/lib/uri/uri_parser.h',
                       'src/core/load_balancing/address_filtering.h',
                       'src/core/load_balancing/backend_metric_data.h',
+                      'src/core/load_balancing/backend_metric_parser.h',
                       'src/core/load_balancing/child_policy_handler.h',
                       'src/core/load_balancing/delegating_helper.h',
                       'src/core/load_balancing/endpoint_list.h',
@@ -1531,8 +1531,7 @@ Pod::Spec.new do |s|
                       'third_party/zlib/zlib.h',
                       'third_party/zlib/zutil.h'
 
-    ss.private_header_files = 'src/core/client_channel/backend_metric.h',
-                              'src/core/client_channel/backup_poller.h',
+    ss.private_header_files = 'src/core/client_channel/backup_poller.h',
                               'src/core/client_channel/client_channel_channelz.h',
                               'src/core/client_channel/client_channel_factory.h',
                               'src/core/client_channel/client_channel_filter.h',
@@ -2517,6 +2516,7 @@ Pod::Spec.new do |s|
                               'src/core/lib/uri/uri_parser.h',
                               'src/core/load_balancing/address_filtering.h',
                               'src/core/load_balancing/backend_metric_data.h',
+                              'src/core/load_balancing/backend_metric_parser.h',
                               'src/core/load_balancing/child_policy_handler.h',
                               'src/core/load_balancing/delegating_helper.h',
                               'src/core/load_balancing/endpoint_list.h',
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index d0ce5cdcff6..f55abe72e8e 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -228,9 +228,7 @@ Pod::Spec.new do |s|
     ss.dependency 'abseil/utility/utility', abseil_version
     ss.compiler_flags = '-DBORINGSSL_PREFIX=GRPC -Wno-unreachable-code -Wno-shorten-64-to-32'
 
-    ss.source_files = 'src/core/client_channel/backend_metric.cc',
-                      'src/core/client_channel/backend_metric.h',
-                      'src/core/client_channel/backup_poller.cc',
+    ss.source_files = 'src/core/client_channel/backup_poller.cc',
                       'src/core/client_channel/backup_poller.h',
                       'src/core/client_channel/channel_connectivity.cc',
                       'src/core/client_channel/client_channel_channelz.cc',
@@ -262,7 +260,6 @@ Pod::Spec.new do |s|
                       'src/core/client_channel/retry_service_config.h',
                       'src/core/client_channel/retry_throttle.cc',
                       'src/core/client_channel/retry_throttle.h',
-                      'src/core/client_channel/service_config_channel_arg_filter.cc',
                       'src/core/client_channel/subchannel.cc',
                       'src/core/client_channel/subchannel.h',
                       'src/core/client_channel/subchannel_interface_internal.h',
@@ -1958,6 +1955,8 @@ Pod::Spec.new do |s|
                       'src/core/load_balancing/address_filtering.cc',
                       'src/core/load_balancing/address_filtering.h',
                       'src/core/load_balancing/backend_metric_data.h',
+                      'src/core/load_balancing/backend_metric_parser.cc',
+                      'src/core/load_balancing/backend_metric_parser.h',
                       'src/core/load_balancing/child_policy_handler.cc',
                       'src/core/load_balancing/child_policy_handler.h',
                       'src/core/load_balancing/delegating_helper.h',
@@ -2048,6 +2047,7 @@ Pod::Spec.new do |s|
                       'src/core/resolver/xds/xds_resolver_trace.h',
                       'src/core/service_config/service_config.h',
                       'src/core/service_config/service_config_call_data.h',
+                      'src/core/service_config/service_config_channel_arg_filter.cc',
                       'src/core/service_config/service_config_impl.cc',
                       'src/core/service_config/service_config_impl.h',
                       'src/core/service_config/service_config_parser.cc',
@@ -2330,8 +2330,7 @@ Pod::Spec.new do |s|
                       'third_party/zlib/zlib.h',
                       'third_party/zlib/zutil.c',
                       'third_party/zlib/zutil.h'
-    ss.private_header_files = 'src/core/client_channel/backend_metric.h',
-                              'src/core/client_channel/backup_poller.h',
+    ss.private_header_files = 'src/core/client_channel/backup_poller.h',
                               'src/core/client_channel/client_channel_channelz.h',
                               'src/core/client_channel/client_channel_factory.h',
                               'src/core/client_channel/client_channel_filter.h',
@@ -3295,6 +3294,7 @@ Pod::Spec.new do |s|
                               'src/core/lib/uri/uri_parser.h',
                               'src/core/load_balancing/address_filtering.h',
                               'src/core/load_balancing/backend_metric_data.h',
+                              'src/core/load_balancing/backend_metric_parser.h',
                               'src/core/load_balancing/child_policy_handler.h',
                               'src/core/load_balancing/delegating_helper.h',
                               'src/core/load_balancing/endpoint_list.h',
diff --git a/grpc.gemspec b/grpc.gemspec
index e05517f5357..6ceb9e0e50a 100644
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -121,8 +121,6 @@ Gem::Specification.new do |s|
   s.files += %w( include/grpc/support/thd_id.h )
   s.files += %w( include/grpc/support/time.h )
   s.files += %w( include/grpc/support/workaround_list.h )
-  s.files += %w( src/core/client_channel/backend_metric.cc )
-  s.files += %w( src/core/client_channel/backend_metric.h )
   s.files += %w( src/core/client_channel/backup_poller.cc )
   s.files += %w( src/core/client_channel/backup_poller.h )
   s.files += %w( src/core/client_channel/channel_connectivity.cc )
@@ -155,7 +153,6 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/client_channel/retry_service_config.h )
   s.files += %w( src/core/client_channel/retry_throttle.cc )
   s.files += %w( src/core/client_channel/retry_throttle.h )
-  s.files += %w( src/core/client_channel/service_config_channel_arg_filter.cc )
   s.files += %w( src/core/client_channel/subchannel.cc )
   s.files += %w( src/core/client_channel/subchannel.h )
   s.files += %w( src/core/client_channel/subchannel_interface_internal.h )
@@ -1851,6 +1848,8 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/load_balancing/address_filtering.cc )
   s.files += %w( src/core/load_balancing/address_filtering.h )
   s.files += %w( src/core/load_balancing/backend_metric_data.h )
+  s.files += %w( src/core/load_balancing/backend_metric_parser.cc )
+  s.files += %w( src/core/load_balancing/backend_metric_parser.h )
   s.files += %w( src/core/load_balancing/child_policy_handler.cc )
   s.files += %w( src/core/load_balancing/child_policy_handler.h )
   s.files += %w( src/core/load_balancing/delegating_helper.h )
@@ -1941,6 +1940,7 @@ Gem::Specification.new do |s|
   s.files += %w( src/core/resolver/xds/xds_resolver_trace.h )
   s.files += %w( src/core/service_config/service_config.h )
   s.files += %w( src/core/service_config/service_config_call_data.h )
+  s.files += %w( src/core/service_config/service_config_channel_arg_filter.cc )
   s.files += %w( src/core/service_config/service_config_impl.cc )
   s.files += %w( src/core/service_config/service_config_impl.h )
   s.files += %w( src/core/service_config/service_config_parser.cc )
diff --git a/grpc.gyp b/grpc.gyp
index defb544f104..045162a458c 100644
--- a/grpc.gyp
+++ b/grpc.gyp
@@ -272,7 +272,6 @@
         'address_sorting',
       ],
       'sources': [
-        'src/core/client_channel/backend_metric.cc',
         'src/core/client_channel/backup_poller.cc',
         'src/core/client_channel/channel_connectivity.cc',
         'src/core/client_channel/client_channel_channelz.cc',
@@ -289,7 +288,6 @@
         'src/core/client_channel/retry_filter_legacy_call_data.cc',
         'src/core/client_channel/retry_service_config.cc',
         'src/core/client_channel/retry_throttle.cc',
-        'src/core/client_channel/service_config_channel_arg_filter.cc',
         'src/core/client_channel/subchannel.cc',
         'src/core/client_channel/subchannel_pool_interface.cc',
         'src/core/client_channel/subchannel_stream_client.cc',
@@ -992,6 +990,7 @@
         'src/core/lib/transport/transport_op_string.cc',
         'src/core/lib/uri/uri_parser.cc',
         'src/core/load_balancing/address_filtering.cc',
+        'src/core/load_balancing/backend_metric_parser.cc',
         'src/core/load_balancing/child_policy_handler.cc',
         'src/core/load_balancing/endpoint_list.cc',
         'src/core/load_balancing/grpclb/client_load_reporting_filter.cc',
@@ -1040,6 +1039,7 @@
         'src/core/resolver/xds/xds_dependency_manager.cc',
         'src/core/resolver/xds/xds_resolver.cc',
         'src/core/resolver/xds/xds_resolver_trace.cc',
+        'src/core/service_config/service_config_channel_arg_filter.cc',
         'src/core/service_config/service_config_impl.cc',
         'src/core/service_config/service_config_parser.cc',
         'src/core/tsi/alts/crypt/aes_gcm.cc',
@@ -1143,7 +1143,6 @@
         'address_sorting',
       ],
       'sources': [
-        'src/core/client_channel/backend_metric.cc',
         'src/core/client_channel/backup_poller.cc',
         'src/core/client_channel/channel_connectivity.cc',
         'src/core/client_channel/client_channel_channelz.cc',
@@ -1160,7 +1159,6 @@
         'src/core/client_channel/retry_filter_legacy_call_data.cc',
         'src/core/client_channel/retry_service_config.cc',
         'src/core/client_channel/retry_throttle.cc',
-        'src/core/client_channel/service_config_channel_arg_filter.cc',
         'src/core/client_channel/subchannel.cc',
         'src/core/client_channel/subchannel_pool_interface.cc',
         'src/core/client_channel/subchannel_stream_client.cc',
@@ -1493,6 +1491,7 @@
         'src/core/lib/transport/transport_op_string.cc',
         'src/core/lib/uri/uri_parser.cc',
         'src/core/load_balancing/address_filtering.cc',
+        'src/core/load_balancing/backend_metric_parser.cc',
         'src/core/load_balancing/child_policy_handler.cc',
         'src/core/load_balancing/endpoint_list.cc',
         'src/core/load_balancing/grpclb/client_load_reporting_filter.cc',
@@ -1531,6 +1530,7 @@
         'src/core/resolver/resolver.cc',
         'src/core/resolver/resolver_registry.cc',
         'src/core/resolver/sockaddr/sockaddr_resolver.cc',
+        'src/core/service_config/service_config_channel_arg_filter.cc',
         'src/core/service_config/service_config_impl.cc',
         'src/core/service_config/service_config_parser.cc',
         'src/core/tsi/alts/handshaker/transport_security_common_api.cc',
diff --git a/package.xml b/package.xml
index 11cea713fdd..27eececb580 100644
--- a/package.xml
+++ b/package.xml
@@ -103,8 +103,6 @@
     <file baseinstalldir="/" name="include/grpc/support/thd_id.h" role="src" />
     <file baseinstalldir="/" name="include/grpc/support/time.h" role="src" />
     <file baseinstalldir="/" name="include/grpc/support/workaround_list.h" role="src" />
-    <file baseinstalldir="/" name="src/core/client_channel/backend_metric.cc" role="src" />
-    <file baseinstalldir="/" name="src/core/client_channel/backend_metric.h" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/backup_poller.cc" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/backup_poller.h" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/channel_connectivity.cc" role="src" />
@@ -137,7 +135,6 @@
     <file baseinstalldir="/" name="src/core/client_channel/retry_service_config.h" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/retry_throttle.cc" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/retry_throttle.h" role="src" />
-    <file baseinstalldir="/" name="src/core/client_channel/service_config_channel_arg_filter.cc" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/subchannel.cc" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/subchannel.h" role="src" />
     <file baseinstalldir="/" name="src/core/client_channel/subchannel_interface_internal.h" role="src" />
@@ -1833,6 +1830,8 @@
     <file baseinstalldir="/" name="src/core/load_balancing/address_filtering.cc" role="src" />
     <file baseinstalldir="/" name="src/core/load_balancing/address_filtering.h" role="src" />
     <file baseinstalldir="/" name="src/core/load_balancing/backend_metric_data.h" role="src" />
+    <file baseinstalldir="/" name="src/core/load_balancing/backend_metric_parser.cc" role="src" />
+    <file baseinstalldir="/" name="src/core/load_balancing/backend_metric_parser.h" role="src" />
     <file baseinstalldir="/" name="src/core/load_balancing/child_policy_handler.cc" role="src" />
     <file baseinstalldir="/" name="src/core/load_balancing/child_policy_handler.h" role="src" />
     <file baseinstalldir="/" name="src/core/load_balancing/delegating_helper.h" role="src" />
@@ -1923,6 +1922,7 @@
     <file baseinstalldir="/" name="src/core/resolver/xds/xds_resolver_trace.h" role="src" />
     <file baseinstalldir="/" name="src/core/service_config/service_config.h" role="src" />
     <file baseinstalldir="/" name="src/core/service_config/service_config_call_data.h" role="src" />
+    <file baseinstalldir="/" name="src/core/service_config/service_config_channel_arg_filter.cc" role="src" />
     <file baseinstalldir="/" name="src/core/service_config/service_config_impl.cc" role="src" />
     <file baseinstalldir="/" name="src/core/service_config/service_config_impl.h" role="src" />
     <file baseinstalldir="/" name="src/core/service_config/service_config_parser.cc" role="src" />
diff --git a/src/core/BUILD b/src/core/BUILD
index 23f5dc97499..b9fd4b05ee2 100644
--- a/src/core/BUILD
+++ b/src/core/BUILD
@@ -2977,6 +2977,266 @@ grpc_cc_library(
     ],
 )
 
+grpc_cc_library(
+    name = "client_channel_internal_header",
+    hdrs = [
+        "client_channel/client_channel_internal.h",
+    ],
+    external_deps = [
+        "absl/functional:any_invocable",
+    ],
+    language = "c++",
+    deps = [
+        "arena",
+        "grpc_service_config",
+        "lb_policy",
+        "unique_type_name",
+        "//:gpr_public_hdrs",
+        "//:grpc_base",
+        "//:legacy_context",
+    ],
+)
+
+grpc_cc_library(
+    name = "subchannel_connector",
+    hdrs = [
+        "client_channel/connector.h",
+    ],
+    language = "c++",
+    deps = [
+        "channel_args",
+        "closure",
+        "error",
+        "iomgr_fwd",
+        "resolved_address",
+        "time",
+        "//:channelz",
+        "//:gpr_platform",
+        "//:grpc_base",
+        "//:iomgr",
+        "//:orphanable",
+        "//:ref_counted_ptr",
+    ],
+)
+
+grpc_cc_library(
+    name = "subchannel_pool_interface",
+    srcs = [
+        "client_channel/subchannel_pool_interface.cc",
+    ],
+    hdrs = [
+        "client_channel/subchannel_pool_interface.h",
+    ],
+    external_deps = [
+        "absl/status",
+        "absl/status:statusor",
+        "absl/strings",
+    ],
+    language = "c++",
+    deps = [
+        "channel_args",
+        "ref_counted",
+        "resolved_address",
+        "useful",
+        "//:gpr_platform",
+        "//:grpc_trace",
+        "//:ref_counted_ptr",
+        "//:sockaddr_utils",
+    ],
+)
+
+grpc_cc_library(
+    name = "config_selector",
+    srcs = [
+        "client_channel/config_selector.cc",
+    ],
+    hdrs = [
+        "client_channel/config_selector.h",
+    ],
+    external_deps = [
+        "absl/status",
+        "absl/strings",
+    ],
+    language = "c++",
+    deps = [
+        "arena",
+        "channel_args",
+        "channel_fwd",
+        "client_channel_internal_header",
+        "grpc_service_config",
+        "metadata_batch",
+        "ref_counted",
+        "slice",
+        "useful",
+        "//:gpr_public_hdrs",
+        "//:grpc_public_hdrs",
+        "//:ref_counted_ptr",
+    ],
+)
+
+grpc_cc_library(
+    name = "client_channel_service_config",
+    srcs = [
+        "client_channel/client_channel_service_config.cc",
+    ],
+    hdrs = [
+        "client_channel/client_channel_service_config.h",
+    ],
+    external_deps = [
+        "absl/status",
+        "absl/status:statusor",
+        "absl/strings",
+        "absl/types:optional",
+    ],
+    language = "c++",
+    deps = [
+        "channel_args",
+        "json",
+        "json_args",
+        "json_object_loader",
+        "lb_policy",
+        "lb_policy_registry",
+        "service_config_parser",
+        "time",
+        "validation_errors",
+        "//:config",
+        "//:gpr_platform",
+        "//:ref_counted_ptr",
+    ],
+)
+
+grpc_cc_library(
+    name = "retry_service_config",
+    srcs = [
+        "client_channel/retry_service_config.cc",
+    ],
+    hdrs = [
+        "client_channel/retry_service_config.h",
+    ],
+    external_deps = [
+        "absl/strings",
+        "absl/types:optional",
+    ],
+    language = "c++",
+    deps = [
+        "channel_args",
+        "json",
+        "json_args",
+        "json_channel_args",
+        "json_object_loader",
+        "service_config_parser",
+        "time",
+        "validation_errors",
+        "//:channel_arg_names",
+        "//:config",
+        "//:gpr_public_hdrs",
+        "//:grpc_base",
+        "//:grpc_public_hdrs",
+    ],
+)
+
+grpc_cc_library(
+    name = "retry_throttle",
+    srcs = [
+        "client_channel/retry_throttle.cc",
+    ],
+    hdrs = [
+        "client_channel/retry_throttle.h",
+    ],
+    external_deps = [
+        "absl/base:core_headers",
+    ],
+    language = "c++",
+    deps = [
+        "gpr_atm",
+        "ref_counted",
+        "//:gpr",
+        "//:ref_counted_ptr",
+    ],
+)
+
+grpc_cc_library(
+    name = "client_channel_backup_poller",
+    srcs = [
+        "client_channel/backup_poller.cc",
+    ],
+    hdrs = [
+        "client_channel/backup_poller.h",
+    ],
+    external_deps = [
+        "absl/status",
+    ],
+    language = "c++",
+    deps = [
+        "closure",
+        "error",
+        "iomgr_fwd",
+        "pollset_set",
+        "time",
+        "//:config_vars",
+        "//:gpr",
+        "//:gpr_platform",
+        "//:iomgr",
+        "//:iomgr_timer",
+    ],
+)
+
+grpc_cc_library(
+    name = "client_channel_channelz",
+    srcs = [
+        "client_channel/client_channel_channelz.cc",
+    ],
+    hdrs = [
+        "client_channel/client_channel_channelz.h",
+    ],
+    external_deps = [
+        "absl/base:core_headers",
+        "absl/strings",
+    ],
+    language = "c++",
+    deps = [
+        "connectivity_state",
+        "json",
+        "//:channelz",
+        "//:gpr",
+        "//:grpc_public_hdrs",
+        "//:ref_counted_ptr",
+    ],
+)
+
+grpc_cc_library(
+    name = "service_config_channel_arg_filter",
+    srcs = [
+        "service_config/service_config_channel_arg_filter.cc",
+    ],
+    external_deps = [
+        "absl/status",
+        "absl/status:statusor",
+        "absl/types:optional",
+    ],
+    language = "c++",
+    deps = [
+        "arena",
+        "arena_promise",
+        "channel_args",
+        "channel_fwd",
+        "channel_stack_type",
+        "context",
+        "grpc_message_size_filter",
+        "grpc_service_config",
+        "metadata_batch",
+        "service_config_parser",
+        "//:channel_arg_names",
+        "//:config",
+        "//:gpr_platform",
+        "//:gpr_public_hdrs",
+        "//:grpc_base",
+        "//:grpc_service_config_impl",
+        "//:legacy_context",
+        "//:ref_counted_ptr",
+    ],
+)
+
 grpc_cc_library(
     name = "lb_policy",
     srcs = ["load_balancing/lb_policy.cc"],
@@ -3082,6 +3342,28 @@ grpc_cc_library(
     ],
 )
 
+grpc_cc_library(
+    name = "backend_metric_parser",
+    srcs = [
+        "load_balancing/backend_metric_parser.cc",
+    ],
+    hdrs = [
+        "load_balancing/backend_metric_parser.h",
+    ],
+    external_deps = [
+        "absl/strings",
+        "upb_base_lib",
+        "upb_mem_lib",
+        "upb_message_lib",
+    ],
+    language = "c++",
+    deps = [
+        "grpc_backend_metric_data",
+        "xds_orca_upb",
+        "//:gpr_platform",
+    ],
+)
+
 grpc_cc_library(
     name = "proxy_mapper",
     hdrs = ["lib/handshaker/proxy_mapper.h"],
@@ -3112,6 +3394,39 @@ grpc_cc_library(
     ],
 )
 
+grpc_cc_library(
+    name = "http_proxy_mapper",
+    srcs = [
+        "client_channel/http_proxy_mapper.cc",
+    ],
+    hdrs = [
+        "client_channel/http_proxy_mapper.h",
+    ],
+    external_deps = [
+        "absl/status",
+        "absl/status:statusor",
+        "absl/strings",
+        "absl/types:optional",
+    ],
+    language = "c++",
+    deps = [
+        "channel_args",
+        "env",
+        "experiments",
+        "proxy_mapper",
+        "resolved_address",
+        "//:channel_arg_names",
+        "//:config",
+        "//:gpr",
+        "//:grpc_base",
+        "//:http_connect_handshaker",
+        "//:iomgr",
+        "//:parse_address",
+        "//:sockaddr_utils",
+        "//:uri_parser",
+    ],
+)
+
 grpc_cc_library(
     name = "grpc_server_config_selector",
     hdrs = [
@@ -4373,6 +4688,7 @@ grpc_cc_library(
         "//:grpc_resolver_fake",
         "//:grpc_security_base",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:protobuf_duration_upb",
         "//:protobuf_timestamp_upb",
@@ -4469,6 +4785,7 @@ grpc_cc_library(
         "//:grpc_security_base",
         "//:grpc_service_config_impl",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:rls_upb",
@@ -4869,6 +5186,7 @@ grpc_cc_library(
     language = "c++",
     deps = [
         "channel_args",
+        "client_channel_internal_header",
         "connectivity_state",
         "delegating_helper",
         "grpc_backend_metric_data",
@@ -4893,6 +5211,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:xds_client",
@@ -4913,6 +5232,7 @@ grpc_cc_library(
     language = "c++",
     deps = [
         "channel_args",
+        "client_channel_internal_header",
         "connectivity_state",
         "delegating_helper",
         "grpc_resolver_xds_attributes",
@@ -4934,6 +5254,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:work_serializer",
@@ -5023,6 +5344,8 @@ grpc_cc_library(
     language = "c++",
     deps = [
         "channel_args",
+        "client_channel_channelz",
+        "client_channel_internal_header",
         "closure",
         "connectivity_state",
         "error",
@@ -5247,6 +5570,7 @@ grpc_cc_library(
     language = "c++",
     deps = [
         "channel_args",
+        "client_channel_internal_header",
         "closure",
         "connectivity_state",
         "delegating_helper",
@@ -5378,6 +5702,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:oob_backend_metric",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:server_address",
@@ -5445,6 +5770,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:sockaddr_utils",
@@ -5488,6 +5814,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:work_serializer",
@@ -5531,6 +5858,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:ref_counted_ptr",
         "//:work_serializer",
@@ -5558,6 +5886,7 @@ grpc_cc_library(
     language = "c++",
     deps = [
         "channel_args",
+        "client_channel_internal_header",
         "closure",
         "connectivity_state",
         "delegating_helper",
@@ -5587,6 +5916,7 @@ grpc_cc_library(
         "//:grpc_base",
         "//:grpc_client_channel",
         "//:grpc_trace",
+        "//:lb_child_policy_handler",
         "//:orphanable",
         "//:parse_address",
         "//:ref_counted_ptr",
@@ -5972,6 +6302,8 @@ grpc_cc_library(
         "arena_promise",
         "channel_args",
         "channel_fwd",
+        "client_channel_internal_header",
+        "config_selector",
         "context",
         "dual_ref_counted",
         "experiments",
@@ -6279,6 +6611,7 @@ grpc_cc_library(
         "handshaker_registry",
         "resolved_address",
         "status_helper",
+        "subchannel_connector",
         "tcp_connect_handshaker",
         "time",
         "unique_type_name",
@@ -7086,6 +7419,7 @@ grpc_cc_library(
         "sleep",
         "slice",
         "slice_buffer",
+        "subchannel_connector",
         "time",
         "try_seq",
         "wait_for_callback",
diff --git a/src/core/client_channel/client_channel_filter.cc b/src/core/client_channel/client_channel_filter.cc
index fdd7a848d60..42ad79f73d5 100644
--- a/src/core/client_channel/client_channel_filter.cc
+++ b/src/core/client_channel/client_channel_filter.cc
@@ -49,7 +49,6 @@
 #include <grpc/support/string_util.h>
 #include <grpc/support/time.h>
 
-#include "src/core/client_channel/backend_metric.h"
 #include "src/core/client_channel/backup_poller.h"
 #include "src/core/client_channel/client_channel_channelz.h"
 #include "src/core/client_channel/client_channel_internal.h"
@@ -92,8 +91,6 @@
 #include "src/core/lib/promise/promise.h"
 #include "src/core/lib/promise/try_seq.h"
 #include "src/core/lib/security/credentials/credentials.h"
-#include "src/core/service_config/service_config_call_data.h"
-#include "src/core/service_config/service_config_impl.h"
 #include "src/core/lib/slice/slice.h"
 #include "src/core/lib/slice/slice_internal.h"
 #include "src/core/lib/surface/call.h"
@@ -101,11 +98,14 @@
 #include "src/core/lib/transport/connectivity_state.h"
 #include "src/core/lib/transport/error_utils.h"
 #include "src/core/lib/transport/metadata_batch.h"
+#include "src/core/load_balancing/backend_metric_parser.h"
 #include "src/core/load_balancing/child_policy_handler.h"
 #include "src/core/load_balancing/lb_policy_registry.h"
 #include "src/core/load_balancing/subchannel_interface.h"
 #include "src/core/resolver/endpoint_addresses.h"
 #include "src/core/resolver/resolver_registry.h"
+#include "src/core/service_config/service_config_call_data.h"
+#include "src/core/service_config/service_config_impl.h"
 
 //
 // Client channel filter
diff --git a/src/core/client_channel/backend_metric.cc b/src/core/load_balancing/backend_metric_parser.cc
similarity index 98%
rename from src/core/client_channel/backend_metric.cc
rename to src/core/load_balancing/backend_metric_parser.cc
index 31423662a18..968fc287b36 100644
--- a/src/core/client_channel/backend_metric.cc
+++ b/src/core/load_balancing/backend_metric_parser.cc
@@ -16,7 +16,7 @@
 
 #include <grpc/support/port_platform.h>
 
-#include "src/core/client_channel/backend_metric.h"
+#include "src/core/load_balancing/backend_metric_parser.h"
 
 #include <string.h>
 
diff --git a/src/core/client_channel/backend_metric.h b/src/core/load_balancing/backend_metric_parser.h
similarity index 87%
rename from src/core/client_channel/backend_metric.h
rename to src/core/load_balancing/backend_metric_parser.h
index 15670c24ca5..3ee75c9c556 100644
--- a/src/core/client_channel/backend_metric.h
+++ b/src/core/load_balancing/backend_metric_parser.h
@@ -14,8 +14,8 @@
 // limitations under the License.
 //
 
-#ifndef GRPC_SRC_CORE_CLIENT_CHANNEL_BACKEND_METRIC_H
-#define GRPC_SRC_CORE_CLIENT_CHANNEL_BACKEND_METRIC_H
+#ifndef GRPC_SRC_CORE_LOAD_BALANCING_BACKEND_METRIC_PARSER_H
+#define GRPC_SRC_CORE_LOAD_BALANCING_BACKEND_METRIC_PARSER_H
 
 #include <grpc/support/port_platform.h>
 
@@ -44,4 +44,4 @@ const BackendMetricData* ParseBackendMetricData(
 
 }  // namespace grpc_core
 
-#endif  // GRPC_SRC_CORE_CLIENT_CHANNEL_BACKEND_METRIC_H
+#endif  // GRPC_SRC_CORE_LOAD_BALANCING_BACKEND_METRIC_PARSER_H
diff --git a/src/core/load_balancing/oob_backend_metric.cc b/src/core/load_balancing/oob_backend_metric.cc
index ac7bcb36154..9156c7aa4e6 100644
--- a/src/core/load_balancing/oob_backend_metric.cc
+++ b/src/core/load_balancing/oob_backend_metric.cc
@@ -38,9 +38,7 @@
 #include <grpc/support/log.h>
 #include <grpc/support/time.h>
 
-#include "src/core/client_channel/backend_metric.h"
 #include "src/core/client_channel/client_channel_channelz.h"
-#include "src/core/load_balancing/oob_backend_metric_internal.h"
 #include "src/core/client_channel/subchannel.h"
 #include "src/core/client_channel/subchannel_stream_client.h"
 #include "src/core/lib/channel/channel_trace.h"
@@ -57,6 +55,8 @@
 #include "src/core/lib/iomgr/iomgr_fwd.h"
 #include "src/core/lib/iomgr/pollset_set.h"
 #include "src/core/lib/slice/slice.h"
+#include "src/core/load_balancing/backend_metric_parser.h"
+#include "src/core/load_balancing/oob_backend_metric_internal.h"
 
 namespace grpc_core {
 
diff --git a/src/core/load_balancing/oob_backend_metric.h b/src/core/load_balancing/oob_backend_metric.h
index b31a4c748cb..b90e12889c9 100644
--- a/src/core/load_balancing/oob_backend_metric.h
+++ b/src/core/load_balancing/oob_backend_metric.h
@@ -21,8 +21,8 @@
 
 #include <memory>
 
-#include "src/core/load_balancing/backend_metric_data.h"
 #include "src/core/lib/gprpp/time.h"
+#include "src/core/load_balancing/backend_metric_data.h"
 #include "src/core/load_balancing/subchannel_interface.h"
 
 namespace grpc_core {
diff --git a/src/core/client_channel/service_config_channel_arg_filter.cc b/src/core/service_config/service_config_channel_arg_filter.cc
similarity index 100%
rename from src/core/client_channel/service_config_channel_arg_filter.cc
rename to src/core/service_config/service_config_channel_arg_filter.cc
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index f0827017e9f..78472d72eb9 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -15,7 +15,6 @@
 # AUTO-GENERATED FROM `$REPO_ROOT/templates/src/python/grpcio/grpc_core_dependencies.py.template`!!!
 
 CORE_SOURCE_FILES = [
-    'src/core/client_channel/backend_metric.cc',
     'src/core/client_channel/backup_poller.cc',
     'src/core/client_channel/channel_connectivity.cc',
     'src/core/client_channel/client_channel_channelz.cc',
@@ -32,7 +31,6 @@ CORE_SOURCE_FILES = [
     'src/core/client_channel/retry_filter_legacy_call_data.cc',
     'src/core/client_channel/retry_service_config.cc',
     'src/core/client_channel/retry_throttle.cc',
-    'src/core/client_channel/service_config_channel_arg_filter.cc',
     'src/core/client_channel/subchannel.cc',
     'src/core/client_channel/subchannel_pool_interface.cc',
     'src/core/client_channel/subchannel_stream_client.cc',
@@ -780,6 +778,7 @@ CORE_SOURCE_FILES = [
     'src/core/lib/transport/transport_op_string.cc',
     'src/core/lib/uri/uri_parser.cc',
     'src/core/load_balancing/address_filtering.cc',
+    'src/core/load_balancing/backend_metric_parser.cc',
     'src/core/load_balancing/child_policy_handler.cc',
     'src/core/load_balancing/endpoint_list.cc',
     'src/core/load_balancing/grpclb/client_load_reporting_filter.cc',
@@ -828,6 +827,7 @@ CORE_SOURCE_FILES = [
     'src/core/resolver/xds/xds_dependency_manager.cc',
     'src/core/resolver/xds/xds_resolver.cc',
     'src/core/resolver/xds/xds_resolver_trace.cc',
+    'src/core/service_config/service_config_channel_arg_filter.cc',
     'src/core/service_config/service_config_impl.cc',
     'src/core/service_config/service_config_parser.cc',
     'src/core/tsi/alts/crypt/aes_gcm.cc',
diff --git a/test/core/client_channel/BUILD b/test/core/client_channel/BUILD
index 48c8d7295d2..db32f642365 100644
--- a/test/core/client_channel/BUILD
+++ b/test/core/client_channel/BUILD
@@ -28,6 +28,7 @@ grpc_cc_test(
     deps = [
         "//:grpc_client_channel",
         "//src/core:channel_args",
+        "//src/core:subchannel_pool_interface",
         "//test/core/util:grpc_test_util",
     ],
 )
diff --git a/test/core/client_channel/lb_policy/BUILD b/test/core/client_channel/lb_policy/BUILD
index ca181c2b2e8..d0422a50a40 100644
--- a/test/core/client_channel/lb_policy/BUILD
+++ b/test/core/client_channel/lb_policy/BUILD
@@ -32,8 +32,11 @@ grpc_cc_library(
     ],
     language = "C++",
     deps = [
+        "//:oob_backend_metric",
+        "//src/core:client_channel_internal_header",
         "//src/core:lb_policy",
         "//src/core:subchannel_interface",
+        "//src/core:subchannel_pool_interface",
         "//test/core/event_engine:event_engine_test_utils",
         "//test/core/event_engine/fuzzing_event_engine",
     ],
@@ -127,6 +130,7 @@ grpc_cc_test(
     uses_polling = False,
     deps = [
         "//:grpc",
+        "//src/core:client_channel_service_config",
         "//test/core/util:grpc_test_util",
     ],
 )
diff --git a/test/core/util/BUILD b/test/core/util/BUILD
index e902bd2def0..2de9ece5fff 100644
--- a/test/core/util/BUILD
+++ b/test/core/util/BUILD
@@ -311,6 +311,7 @@ grpc_cc_library(
         "//:gpr",
         "//:grpc",
         "//:grpc_client_channel",
+        "//:oob_backend_metric",
         "//:orphanable",
         "//:parse_address",
         "//:ref_counted_ptr",
diff --git a/test/cpp/end2end/BUILD b/test/cpp/end2end/BUILD
index b69adaf4654..c06aafc882e 100644
--- a/test/cpp/end2end/BUILD
+++ b/test/cpp/end2end/BUILD
@@ -532,6 +532,7 @@ grpc_cc_test(
         "//:grpcpp_call_metric_recorder",
         "//:grpcpp_orca_service",
         "//src/core:channel_args",
+        "//src/core:config_selector",
         "//src/proto/grpc/health/v1:health_proto",
         "//src/proto/grpc/testing:echo_messages_proto",
         "//src/proto/grpc/testing:echo_proto",
diff --git a/tools/doxygen/Doxyfile.c++.internal b/tools/doxygen/Doxyfile.c++.internal
index f92d69c3080..c197f62a38a 100644
--- a/tools/doxygen/Doxyfile.c++.internal
+++ b/tools/doxygen/Doxyfile.c++.internal
@@ -1081,8 +1081,6 @@ include/grpcpp/support/time.h \
 include/grpcpp/support/validate_service_config.h \
 include/grpcpp/version_info.h \
 include/grpcpp/xds_server_builder.h \
-src/core/client_channel/backend_metric.cc \
-src/core/client_channel/backend_metric.h \
 src/core/client_channel/backup_poller.cc \
 src/core/client_channel/backup_poller.h \
 src/core/client_channel/channel_connectivity.cc \
@@ -1115,7 +1113,6 @@ src/core/client_channel/retry_service_config.cc \
 src/core/client_channel/retry_service_config.h \
 src/core/client_channel/retry_throttle.cc \
 src/core/client_channel/retry_throttle.h \
-src/core/client_channel/service_config_channel_arg_filter.cc \
 src/core/client_channel/subchannel.cc \
 src/core/client_channel/subchannel.h \
 src/core/client_channel/subchannel_interface_internal.h \
@@ -2850,6 +2847,8 @@ src/core/lib/uri/uri_parser.h \
 src/core/load_balancing/address_filtering.cc \
 src/core/load_balancing/address_filtering.h \
 src/core/load_balancing/backend_metric_data.h \
+src/core/load_balancing/backend_metric_parser.cc \
+src/core/load_balancing/backend_metric_parser.h \
 src/core/load_balancing/child_policy_handler.cc \
 src/core/load_balancing/child_policy_handler.h \
 src/core/load_balancing/delegating_helper.h \
@@ -2940,6 +2939,7 @@ src/core/resolver/xds/xds_resolver_trace.cc \
 src/core/resolver/xds/xds_resolver_trace.h \
 src/core/service_config/service_config.h \
 src/core/service_config/service_config_call_data.h \
+src/core/service_config/service_config_channel_arg_filter.cc \
 src/core/service_config/service_config_impl.cc \
 src/core/service_config/service_config_impl.h \
 src/core/service_config/service_config_parser.cc \
diff --git a/tools/doxygen/Doxyfile.core.internal b/tools/doxygen/Doxyfile.core.internal
index 03621790ee7..8b61684a971 100644
--- a/tools/doxygen/Doxyfile.core.internal
+++ b/tools/doxygen/Doxyfile.core.internal
@@ -885,8 +885,6 @@ include/grpc/support/time.h \
 include/grpc/support/workaround_list.h \
 src/core/README.md \
 src/core/client_channel/README.md \
-src/core/client_channel/backend_metric.cc \
-src/core/client_channel/backend_metric.h \
 src/core/client_channel/backup_poller.cc \
 src/core/client_channel/backup_poller.h \
 src/core/client_channel/channel_connectivity.cc \
@@ -919,7 +917,6 @@ src/core/client_channel/retry_service_config.cc \
 src/core/client_channel/retry_service_config.h \
 src/core/client_channel/retry_throttle.cc \
 src/core/client_channel/retry_throttle.h \
-src/core/client_channel/service_config_channel_arg_filter.cc \
 src/core/client_channel/subchannel.cc \
 src/core/client_channel/subchannel.h \
 src/core/client_channel/subchannel_interface_internal.h \
@@ -2627,6 +2624,8 @@ src/core/lib/uri/uri_parser.h \
 src/core/load_balancing/address_filtering.cc \
 src/core/load_balancing/address_filtering.h \
 src/core/load_balancing/backend_metric_data.h \
+src/core/load_balancing/backend_metric_parser.cc \
+src/core/load_balancing/backend_metric_parser.h \
 src/core/load_balancing/child_policy_handler.cc \
 src/core/load_balancing/child_policy_handler.h \
 src/core/load_balancing/delegating_helper.h \
@@ -2721,6 +2720,7 @@ src/core/resolver/xds/xds_resolver_trace.cc \
 src/core/resolver/xds/xds_resolver_trace.h \
 src/core/service_config/service_config.h \
 src/core/service_config/service_config_call_data.h \
+src/core/service_config/service_config_channel_arg_filter.cc \
 src/core/service_config/service_config_impl.cc \
 src/core/service_config/service_config_impl.h \
 src/core/service_config/service_config_parser.cc \