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NODATA means no data has been received on that ENI. In case of data missed or skipped in the capture a SKIPPED DATA message is published.
The NODATA message allows you to know if an ENI is actively attached to an instance and receiving/not receiving traffic or is just available in a pool of ENI or was an old ENI whose flowlog data is still available but the ENI has been deleted.
You can see the info about the type of records here: https://docs.aws.amazon.com/vpc/latest/userguide/flow-logs-records-examples.html
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