Introduction to Lifecycle Logs:
Starting with the 11th generation of Dell PowerEdge servers, the iDRAC with Lifecycle Controller provides a feature called Lifecycle Logs which records every action performed on the server. This information can be viewed locally or remotely through various GUI based consoles as well as iDRAC supported command line interfaces.

http://en.community.dell.com/techcenter/b/techcenter/archive/2012/09/19/lifecycle-logs-poweredge-servers-lifecycle-at-your-fingertips.aspx

To download the Lifecycle log:

• Log into iDRAC
• Go to Overview > Server > Logs > Lifecycle Log
• Click export button
• Save XML log file