Performance Data Retention
Zenoss Core stores all performance data (a.k.a., metrics) in HBase using OpenTSDB. The default retention policy saves performance data for 90 days. To change the default, the time to live (TTL) must be adjusted on the OpenTSDB column families in HBase.
Once a TTL value is changed, the data retention will adjust on the next major HBase compaction, which by default is once per day.