How get list of questions that bot didn't understand?

Rasa Open Source
1

I need to collect and send once a week, a list of words/sentences that rasa chatbot failed to answer, to a team, who will then add examples and then train the bot again,

How to do it?

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2

Create your own fallback action which can write the user utterances and NLU prediction information to a file or DB. You can read more about this here

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If you have a tracker store you can do a query to retrieve all the user messages with nlu_fallback intent.

4

Ok and thanks, understand what to do

5

This I don’t understand, can you elaborate more?

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Here’s some example code. This method reads the latest message from tracker store and looks at the predicted intents for the user utterance.

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A tracker store is a part of rasa that saves all the events in the database. You can make a query to obtain the information you want from it, in this case the user messages with a nlu_fallback intent.