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Is your Lambda function generating and returning the whole response? If it is passing the request through to an origin, I think you'd need to add server-timing on the Origin Response trigger, rather than Origin Request. Either way, the server-timing header generated by your Lambda@Edge function or the Origin will only be sent to the user in the event of a cache miss. If your requests are being served from cache, the value generated by the origin or Lambda@Edge for server-timing will not be present.
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