I keep getting this message: message='activity Heartbeat timeout', timeoutType=TIMEOUT_TYPE_HEARTBEAT What is causing this?

Hmm, I don't know enough to give you a confident answer yet. The extracts provided do not contain information related to the 'Heartbeat timeout' error you're encountering. I recommend checking the [Airbyte documentation](https://docs.airbyte.com/) or the [Airbyte Forum](https://discuss.airbyte.io/) for more information or to ask for help from the community.