We have created SLA report on 6th Jan 2022 with compliance period of 1 month. We can't see the history(previous months like October, November) data in SLA.
Release : 20.3
Component : UIM- sla_engine
data_engine raw data retention is set to 35 days. So there is no data for Oct/Nov in RN tables
If there is no data in RN tables it is not possible to get sla data for that time period, unless sla was already calculated for it when the data is there.