By using the vSphere Bitfusion plug-in, you can configure the period that vSphere Bitfusion retains your detailed and summary usage data.
The summary usage data is an aggregated metrics dataset that requires less space on disk. You can keep summary data from 30 to 1000 days, or without expiration date. You can download summary data by using metric REST APIs.
The default detailed data retention policy is 45 days, and the summary data retention policy is 180 days. It is recommended to keep more summary usage data than detailed usage data.
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Note: Any change to a data period, applies to the data that is stored in the future and has no effect on existing data