Hi @bob_lansley,
The issue occurs on any dashboard that uses multi-pick templates that cascade. Basically the child drop down template items don't populate correctly, and since all the graphs use the template value to fetch the panel graphs they don't work either.
I have found that by toggling from one option to another and then back it will cause the child to refresh. Then go to the child and again pick an option, and then another, and it's child will refresh. And so on for as many cascades as there are. Once you have something loaded that is correct click save dashboard. Next time it will then load these template values and you will probably have fewer toggle steps to view something else. Also, if you use the 'related dashboards' picklist on the right side to navigate between dashboards it tries to pre-populate the template values. So this also helps avoid the issue. For example if you start at Cluster dashboard, then pick a site and cluster and use 'Related Dashboards' to go to the Node dashboard, you pick your node, and then use "related dashboards" to go to the port dashboards, I think it will load correctly the first time.
Regarding a fix this is in the hands of the Grafana project to determine. I logged the isssue and they confirmed it's a regression and targetted for 3.1 (the next release) so hopefully someone will pick it up and deliver a fix. Alternately, you could use Grafana 2.6 which did not have this issue.
Cheers,
Chris Madden
Storage Architect, NetApp EMEA (and author of Harvest)
Blog: It all begins with data
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