-`envelope` | `wrapped` / `bare` / `key_only` / `row` | `wrapped` the default envelope structure for changefeed messages containing an array of the primary key, a top-level field for the type of message, and the current state of the row (or `null` for deleted rows).<br><br>`bare` removes the `after` key from the changefeed message. When used with `avro` format, `record` will replace the `after` key.<br><br>`key_only` emits only the key and no value, which is faster if you only need to know the key of the changed row.<br><br>`row` emits the row without any additional metadata fields in the message. `row` does not support [`avro` format](#format).<br><br>Refer to [changefeed message envelopes]({% link {{ page.version.version }}/changefeed-message-envelopes.md %}) for more detail on message format.<br><br>Default: `envelope=wrapped`.
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