Logging Code Diary Entries

This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job.

Ask yourself whether printed text is program output or program logs and style accordingingly
Do not report what a program is doing in the imperative
Do not separate new lines from contents in logs
How to use syslog
Log performance penalties may still be incurred at quieter log levels
Send errors to STDERR
What is dmesg
When adding temporary debugging statements for diverse environments it may be easier to give them higher log levels

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