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+`syslog()` source driver: add support for RFC6587 style auto-detection of
+octet-count based framing to avoid confusion that stems from the sender
+using a different protocol to the server.  This is automatically enabled for
+both the `transport(tcp)` and the `transport(tls)` settings.  You can disable
+auto-detection by using `transport(text)` or `transport(framed)`.