I have a topic (e.g. fulfillmentFulfilling) with multiple anonymous consumer groups with it. How to manage them and understand in a better way?

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This can happen when the consumer was added but a group wasn’t specified. I can’t find it in our codebase so I assume that this is something you added. For example, if you have a consumer fulfillmentFulfillingInput you need to add it to the configuration

fulfillmentFulfillingInput:
    group: {replace-with-group-name}
    destination: fulfillmentFulfilling