This recommendation recommend on RI purchase and is based on customer historical usage.

This recommendation identifies ElastiCache as idle and that can be deleted.

This recommendation identifies ElastiCache clusters that are approaching the start of Extended Support charges or are already incurring them, helping you avoid unexpected costs and plan timely engine version upgrades. By default, the recommendation is triggered 90 days before Extended Support fees take effect, and you can customize this lead time in the recommendation preferences to receive earlier notifications based on your operational needs.