For Streaming connectors to ingest events, what is the maximum event size AEP can ingest?
Currently streaming ingestion support up to 1MB of XDM message.
Anything beyond this would trigger error code 413, see below:
|413||Payload too large - thrown when the total payload request is greater than 1MB.|
See https://experienceleague.adobe.com/docs/experience-platform/ingestion/tutorials/streaming-multiple-messages.html for additional information.