Observed after upgrading to UIM 20.4 CU4, the performance data will not go beyond 3 months as per raw retention data i.e. 90 days.
PRD displays data as per data_engine raw data retention setting only and not using historical data setting.
Release : DX UIM 20.4 CU4/CU5
Engineering has fixed similar issue for the metric viewer and fix is already available in DX UIM 20.4 CU5
PRD issue fix is available in DX UIM 20.4 CU6