[[http://dev.splunk.com/view/logging/SP-CAAAFCK|Logging best practices]] from Splunk, useful for application developers.

 * Use clear key-value pairs, with "" for strings with spaces. Commas ok, avoid periods.
 * Time-stamps w/ 4-digit year and time zones.
 * Unique IDs (transaction IDs). Ideally, use the same transaction ID across an entire system so you can see all the events that happened during that transaction.

[[https://paul.querna.org/articles/2011/12/26/log-for-machines-in-json/|Write Logs for Machines, use JSON]]

[[https://itnext.io/logging-like-a-pro-8cc6ad09e415|Logging Like a Pro]]: Theories and best practices for effective application logging