@haimingz PDC retains alerts, exceptions and data derived from alerts & exceptions for 14 days. PDC retains node health, query stats, table stats, usage, index definitions and elastic search status for 30 days. Action cases are retained for 95 days after resolution, unless they are Resolved-Ignore, which are retained forever, There is no archiving in PDC other than implicit archiving from AWS RDS snapshots - by design and intent the goal is to identify and resolve current and recent issues.
There are no configuration options in PDC as shipped to update data retention.
Any change would require customizing rules and I am unable to find any info on this. Perhaps you can approach your Pega AE if this is important to you.