Typically, an audit snapshot would be taken every 90 days, and looks back at consumption during the previous 90 days.
Let’s say, for example, a server was retired on February 28. From January 1 to February 28, it was contributing to PVU consumption. Therefore when you run an audit snapshot on April 1, the data will include this server’s contributions to the PVU count, since it covers the period from January 1 to March 31.
Later on, when you run an audit snapshot on July 1, the report will not show the retired server, since the snapshot covers the period from April 1 to June 30.
Note that retired server data remains available in BFI/LMT database in case you need to re-run the snapshots later on, or do other retrospective reporting.