diff --git a/protos/orchestrator_service.proto b/protos/orchestrator_service.proto
index f566163..c4939ad 100644
--- a/protos/orchestrator_service.proto
+++ b/protos/orchestrator_service.proto
@@ -664,6 +664,9 @@ service TaskHubSidecarService {
 
     // clean entity storage
     rpc CleanEntityStorage(CleanEntityStorageRequest) returns (CleanEntityStorageResponse);
+
+    // send worker metrics to the backend, where they can be aggregated, and used for dynamic adaptations
+    rpc ReportWorkerMetrics(WorkerMetrics) returns (google.protobuf.Empty);
 }
 
 message GetWorkItemsRequest {
@@ -713,4 +716,13 @@ message StreamInstanceHistoryRequest {
 
 message HistoryChunk {
     repeated HistoryEvent events = 1;
-}
\ No newline at end of file
+}
+
+message WorkerMetrics
+{
+    google.protobuf.Timestamp timestamp = 1;
+    google.protobuf.Duration interval = 2;
+    double averageOrchestrationConcurrency = 3;
+    double averageActivityConcurrency = 4;
+    double averageEntityConcurrency = 5;
+}