In this blog post, the author tells the story of how a company called Knight Capital Group went bankrupt in just 45 minutes due to a failed deployment. The company, with nearly $400 million in assets, was the largest trader in US equities at the time. On August 1, 2012, Knight updated their automated trading system, but one of the eight servers was not properly updated, causing old code to be activated. The old code flooded the market with erroneous trades, resulting in a $460 million loss for Knight in just 45 minutes. The author emphasizes the importance of automated and repeatable deployments to avoid such disasters.
https://dougseven.com/2014/04/17/knightmare-a-devops-cautionary-tale/