Occasional 'UnknownHost' logs; Unreliable get-hostname.

[dfrese]

Hello,

in a long running production environment, we observed that the hostname of log messages is occasionally 'UnknownHost'. The cause is of course not timbre's fault, but I can think of three possible remedies (for us):

1. When the lookup in get-hostname fails, use the previous cached result instead of 'UnknownHost'
2. Add some (new?) timbre configuration setting, to set a fixed hostname
3. Write a middleware to replace :_hostname for all messages (if that's possible).

Which one would you prefer? (We can create pull requests if desired)

David.

[ptaoussanis]

Hi there, I'd suggest using a simple middleware to replace all :_hostname values using whatever strategy you'd like re: unknown hosts.

Have also broken up the current hostname stuff into smaller parts for your convenience.

Cheers!

[dfrese]

Thanks!