Support tags on entity-started orchestrations

src/DurableTask.Core/Entities/OperationFormat/StartNewOrchestrationOperationAction.cs

@@ -48,6 +48,15 @@ public class StartNewOrchestrationOperationAction : OperationAction
         /// </summary>
         public string? Input { get; set; }
 
+        /// <summary>
+        /// Gets or sets the tags of the sub-orchestration.
+        /// </summary>
+        /// <remarks>
+        /// These tags override tags inherited from the entity. The runtime always sets the
+        /// <see cref="OrchestrationTags.FireAndForget"/> tag.
+        /// </remarks>
+        public IDictionary<string, string>? Tags { get; set; }
+
         /// <summary>
         /// Gets or sets when to start the orchestration, or null if the orchestration should be started immediately.
         /// </summary>

src/DurableTask.Core/TaskEntityDispatcher.cs

@@ -912,7 +912,9 @@ internal void ProcessSendStartMessage(WorkItemEffects effects, OrchestrationRunt
             {
                 Tags = OrchestrationTags.MergeTags(
                     newTags: new Dictionary<string, string>() { { OrchestrationTags.FireAndForget, "" } },
-                    existingTags: runtimeState.Tags),
+                    existingTags: OrchestrationTags.MergeTags(
+                        newTags: action.Tags,
+                        existingTags: runtimeState.Tags)),
                 OrchestrationInstance = destination,
                 ScheduledStartTime = action.ScheduledStartTime,
                 ParentInstance = new ParentInstance