Commits on Aug 26, 2020

1. Update plank dashboard to filter and group by more things …

   Allow someone to filter and group by:
   - cluster
   - org
   - repo
   - state
   - type
   
   Add a third graph panel, and change each graph panel to group by
   user-selectable labels
   
   I intially had a graph panel for each of these, but:
   - it's a lot of clutter
   - it appeared to be timing out prometheus at the 90d range
   
   It turns out each template re-queries prometheus (serially) anytime the
   dashboard's time-range changes, and only after templates are refreshed do
   queries fired off for the dashboard's panels in parallel. This is necessary
   because the `label_values` prometheus query is time-range dependent.
   
   To mitigate this I changed the "type" and "state" templates to use a hardcoded
   list of values, since I think it unlikely we're going to add new prowjob types
   or states.

   

   spiffxp committed Aug 26, 2020
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