Update destination-functions.md - console.log UI limit

Author: samkcrespo

src/connections/functions/destination-functions.md

@@ -439,3 +439,7 @@ Yes, to do so, remove the `messageId` and the `writeKey` from the payload in you
 ##### Can I view console.log() outputs in Destination Functions?
 
 Incorporating console.log() statements in your Destination Function code aids in debugging. However, logs generated by these statements will only be accessible in the [Event Delivery](/docs/connections/event-delivery/) view if the payloads encounter errors during processing. Logs from successfully processed payloads are not displayed.
+
+##### What is the maximum data size that can be displayed in console.logs() when testing a Function?
+
+The test function interface has a 4KB console logging limit. Outputs surpassing this limit will not be visible in the user interface.