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My preference is:

2017-04-27T02:46:20.762-07:00 [$level] $message

Where $level is one of [debug, info, warn, error] and $message is a string log message.

If your working with distributed systems may want to add $hostname between the date and level.

Full example:

2017-04-27T02:46:20.762-07:00 web4 [warn] unable to connect to mobile interface

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