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e942305214
Historically, log-forward proxy used to preserve host field from input message as much as possible, and if syslog host wasn't provided (rfc5424 '-' or bad rfc3164 or rfc5424 message) then "localhost" or "-" would be used as host when outputting message using rfc3164 or rfc5424. We change that behavior (which corresponds to "keep" host option), so that log-forward now uses "fill" strategy as default: if the host is provided in input message, it is preserved. However if it is missing and IP address from sender is available, we use it.
