' Need the big picture: Why "retention"?

[Scott.Chapman at VerizonWireless.com]

I'm reading the Nagios docs (a rather long trip - thanks for the great docs!) and I'm seeing plenty of references to retention.  I'm new to this and it isn't clicking.

Why would I want retention?  

What's it for?

TIA - I'm a bit confused. :)

Scott




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