Forward bot messages received from /tracker/events route to output channel

changelog/6273.improvement.md

@@ -0,0 +1 @@
+Add `output_channel` query param to `/conversations/<conversation_id>/tracker/events` route. Forward bot messages received by route to output channel.

docs/static/spec/rasa.yml

@@ -154,10 +154,12 @@ paths:
       description: >-
         Appends one or multiple new events to the tracker state of the conversation.
         Any existing events will be kept and the new events will be
-        appended, updating the existing state.
+        appended, updating the existing state. Any BotUttered event will be 
+        forwarded to the channel specified in the ``output_channel`` parameter.
       parameters:
       - $ref: '#/components/parameters/conversation_id'
       - $ref: '#/components/parameters/include_events'
+      - $ref: '#/components/parameters/output_channel'
       requestBody:
         required: true
         content:

rasa/server.py

@@ -500,12 +500,14 @@ async def append_events(request: Request, conversation_id: Text):
             async with app.agent.lock_store.lock(conversation_id):
                 processor = app.agent.create_processor()
                 tracker = processor.get_tracker(conversation_id)
+                output_channel = _get_output_channel(request, tracker)
                 _validate_tracker(tracker, conversation_id)
 
                 events = _get_events_from_request_body(request)
 
                 for event in events:
                     tracker.update(event, app.agent.domain)
+                await processor._send_bot_messages(events, tracker, output_channel)
                 app.agent.tracker_store.save(tracker)
 
             return response.json(tracker.current_state(verbosity))