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Payload uses Content expressions which can be used in the format specified Here:
The content of the payload. You can use a string expression that includes quoted strings ('<string>'), variables ($variable.<variable-name>), input values ($input.<input-name>.<path-to-datum>), string concatenations, and quoted strings that contain ${} as the content. The recommended maximum size of a content expression is 1 KB
https://docs.aws.amazon.com/iotevents/latest/apireference/API_Payload.html
For further assistance on exact syntax and expression, please do reach out to AWS Support with your Alarm model definition and asset model definition and share this post for further assistance. https://support.console.aws.amazon.com/support/home#/case/create
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