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It is documented, at least on this page:

https://docs.aws.amazon.com/elasticloadbalancing/latest/appl...

Right at the top of the page, underneath the header "Limits"

> The maximum size of the response JSON that the Lambda function can send is 1 MB.

Ah this must be relatively new. The only documentation I could find or AWS Support Business Support / Lambda team could give me was a link to:

https://docs.aws.amazon.com/elasticloadbalancing/latest/appl...

Which I complained about because it wasn't mentioned as lambda as a target docs. I guess they amended it.

git blame suggests the change was made 15 months ago, though that doesn't take it to account time to publish. Which I guess just goes to show that it can be tough to find information on the docs, despite them been relatively decent as far as docs go (in my opinion).

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