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diff --git a/src/rpc/envoy.extensions.formatter.metadata.v3.rs b/src/rpc/envoy.extensions.formatter.metadata.v3.rs
new file mode 100644
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+++ b/src/rpc/envoy.extensions.formatter.metadata.v3.rs
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+// @generated
+// This file is @generated by prost-build.
+// \[#protodoc-title: Formatter extension for printing various types of metadata\]
+// \[#extension: envoy.formatter.metadata\]
+
+// Metadata formatter extension implements METADATA command operator that
+// prints all types of metadata. The first parameter taken by METADATA operator defines
+// type of metadata. The following types of metadata are supported (case sensitive):
+//
+// * DYNAMIC
+// * CLUSTER
+// * ROUTE
+// * UPSTREAM_HOST
+// * LISTENER
+// * VIRTUAL_HOST
+//
+// See :ref:`here <config_access_log>` for more information on access log configuration.
+
+/// %METADATA(TYPE:NAMESPACE:KEY):Z%
+///     :ref:`Metadata <envoy_v3_api_msg_config.core.v3.Metadata>` info,
+///     where TYPE is type of metadata (see above for supported types),
+///     NAMESPACE is the filter namespace used when setting the metadata, KEY is an optional
+///     lookup key in the namespace with the option of specifying nested keys separated by ':',
+///     and Z is an optional parameter denoting string truncation up to Z characters long.
+///     The data will be logged as a JSON string. For example, for the following ROUTE metadata:
+///
+///     ``com.test.my_filter: {"test_key": "foo", "test_object": {"inner_key": "bar"}}``
+///
+///     * %METADATA(ROUTE:com.test.my_filter)% will log: ``{"test_key": "foo", "test_object": {"inner_key": "bar"}}``
+///     * %METADATA(ROUTE:com.test.my_filter:test_key)% will log: ``foo``
+///     * %METADATA(ROUTE:com.test.my_filter:test_object)% will log: ``{"inner_key": "bar"}``
+///     * %METADATA(ROUTE:com.test.my_filter:test_object:inner_key)% will log: ``bar``
+///     * %METADATA(ROUTE:com.unknown_filter)% will log: ``-``
+///     * %METADATA(ROUTE:com.test.my_filter:unknown_key)% will log: ``-``
+///     * %METADATA(ROUTE:com.test.my_filter):25% will log (truncation at 25 characters): ``{"test_key": "foo", "test``
+///
+///   .. note::
+///
+///     For typed JSON logs, this operator renders a single value with string, numeric, or boolean type
+///     when the referenced key is a simple value. If the referenced key is a struct or list value, a
+///     JSON struct or list is rendered. Structs and lists may be nested. In any event, the maximum
+///     length is ignored.
+///
+///   .. note::
+///
+///     METADATA(DYNAMIC:NAMESPACE:KEY):Z is equivalent to :ref:`DYNAMIC_METADATA(NAMESPACE:KEY):Z<config_access_log_format_dynamic_metadata>`
+///     METADATA(CLUSTER:NAMESPACE:KEY):Z is equivalent to :ref:`CLUSTER_METADATA(NAMESPACE:KEY):Z<config_access_log_format_cluster_metadata>`
+///     METADATA(UPSTREAM_HOST:NAMESPACE:KEY):Z is equivalent to :ref:`UPSTREAM_METADATA(NAMESPACE:KEY):Z<config_access_log_format_upstream_host_metadata>`
+///
+/// .. warning::
+///    This extension is treated as built-in extension and will be enabled by default now.
+///    It is unnecessary to configure this extension.
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, Copy, PartialEq, ::prost::Message)]
+pub struct Metadata {
+}
+// @@protoc_insertion_point(module)