pergamon: Add route to staging network to be able to check nodes
Pergamon being the monitoring server (icinga).
Note: Implementation wise, this unfolds the current default routes in the yaml. This also adds one route to the staging network.
This one route was not added as default route since the staging network should stay separated from the production network.
Related T1785
Test Plan
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bin/octocatalog pergamon diff: adds the one new route to the staging network on pergamon
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bin/octocatalog (for example worker01)
diff: nothing
Migrated from D1815 (view on Phabricator)