[SAC] [OSGeo] #2514: Add prometheus metrics for dronie

[OSGeo]

#2514: Add prometheus metrics for dronie
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 Reporter:  robe           |       Owner:  robe
     Type:  task           |      Status:  closed
 Priority:  normal         |   Milestone:  Unplanned
Component:  Systems Admin  |  Resolution:  fixed
 Keywords:                 |
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Changes (by robe):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 Installed but sadly no pre-build grafana dashobards, so started building
 one from scratch here:

 https://monitor.osgeo.org/d/vuXuXuFMk/drone-server-dashboard?orgId=2

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2514#comment:2>
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