XorMon NG since v1.9.0 has for all items like server, VM, LPAR, storage ... on its start a 'summary' page with overview of all important configuration and performance information include alert setting on a single page.
Performance data can be switched between day/week/month/year in the selection bottons on the top right.

Examples

VMware VM

IBM Power System : LPAR

IBM Power System : server

Storage

Linux stand-alone

SAN switch

LAN switch

Cloud: Skytap