Include metadata in tasks

Author: cschleiden

internal/task/activity.go

@@ -10,5 +10,7 @@ type Activity struct {
 
 	WorkflowInstance *core.WorkflowInstance
 
+	WorkflowMetadata *core.WorkflowInstanceMetadata
+
 	Event history.Event
 }

internal/task/workflow.go

@@ -12,12 +12,15 @@ type Workflow struct {
 	// WorkflowInstance is the workflow instance that this task is for
 	WorkflowInstance *core.WorkflowInstance
 
+	// TODO: Use this? Or make the span more explicit?
+	Metadata *core.WorkflowInstanceMetadata
+
 	// LastSequenceID is the sequence ID of the newest event in the workflow instances's history
 	LastSequenceID int64
 
 	// NewEvents are new events since the last task execution
 	NewEvents []history.Event
 
-	// Backend specific data
+	// Backend specific data, only the producer of the task should rely on this.
 	CustomData any
 }