What triggers this finding
A running EC2 instance on a previous-generation family (e.g. m3, m4, c3, c4, t2, r3, r4) where a modern equivalent instance type is available at lower cost.
Typical fix
Migrate to the recommended modern instance type. Stop the instance, change the type, then start and verify application compatibility.
Example savings
Often 10–30% of instance cost — varies by family and size.
See also: Severity and savings estimates for how Parsivex calculates figures on your report.