On Call Welcome to another instalment of On Call, The Register 's weekly wander through your tales of tech support.

This week, meet a reader we'll Regomize as "Nick" who in the late 2000s found himself working as a contractor at a London investment bank.

"I had technical oversight of a project related to overnight valuations of the bank's credit derivative products," Nick told On Call.

Some of you may remember those products were a big reason the global economy tanked in 2008. Nick wasn't responsible for that mess, but his job did involve systems that valued the bank's products overnight, so that when trading started in the morning everything was shipshape.

"We needed to know quickly if something did go awry with the process, so we implemented a Log4j plug-in that sent out an email whe

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