Has anyone created a RVTools type program for XenServer. I know i can export 'resource data' from xencenter and can also create my own powershell script to get me what I need, but wondering if anyone is using anything in particular or has anything existing on github?

If you are going down the Grafana route for MSSQL and UberAgent, you can do a prometheus pull of the RRD. https://github.com/MikeDombo/xen-exporter