Escalating errors

From TWikiDotPm:

---++ writeWarning( $text )

Prints date, time, and contents $text to $warningFilename, typically
'warnings.txt'.  Use for warnings and errors that may require admin
intervention.  Not using Store::writeLog; log file is more of an audit/usage
file.  Use this for defensive programming warnings (e.g. assertions).

I'm interested: how do existing installations escalate such warnings?

-- MartinCleaver - 17 Oct 2004