How is the event size in AEP calculated?

[Harveer_SinghGi1]

Hi Team,

As per this KB Article currently streaming ingestion support up to 1MB of Experience Data Model (XDM) message. Can somebody help me understand what all things contribute to the size of the message? For example in a WebSDK ingestion, is it the entire XDM JSON object in the request payload including the XDM keys and values passed in it or is it calculated using just the values passed against XDM keys? Does anything additional to the XDM object like meta, query, events[].query, events[].data objects in below screen shot also contribute to this size?