[syslog-ng] Check if field in message and use default if not.

[Ronald Fenner]

I generate a Kafka topic to send the message to by doing: topic("${topic}.${environment}")
What I'd like to do if the field wasn't in the json message to provide a default value. 

Im looking for like a tertiary operator to use In the topic or perhaps a rewrite rule.

I see the conditional expressions but from the docs it doesn't look like I can use it in the topic or a rewrite rule
NOTE: My messages are json stings that get parsed and then imploded back to json as it's sent.

Thanks

Ronald Fenner
Network Architect
Game Circus LLC.

rfenner at gamecircus.com

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