diff --git a/build/bazel/remote/execution/v2/remote_execution.proto b/build/bazel/remote/execution/v2/remote_execution.proto
index 956e0869..864d5338 100644
--- a/build/bazel/remote/execution/v2/remote_execution.proto
+++ b/build/bazel/remote/execution/v2/remote_execution.proto
@@ -19,6 +19,7 @@ package build.bazel.remote.execution.v2;
 import "build/bazel/semver/semver.proto";
 import "google/api/annotations.proto";
 import "google/longrunning/operations.proto";
+import "google/protobuf/any.proto";
 import "google/protobuf/duration.proto";
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/wrappers.proto";
@@ -855,6 +856,11 @@ message ExecutedActionMetadata {
 
   // When the worker finished uploading action outputs.
   google.protobuf.Timestamp output_upload_completed_timestamp = 10;
+
+  // Details that are specific to the kind of worker used. For example,
+  // on POSIX-like systems this could contain a message with
+  // getrusage(2) statistics.
+  repeated google.protobuf.Any auxiliary_metadata = 11;
 }
 
 // An ActionResult represents the result of an