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Alert on coreDNS misbehaving
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Description

We recently added CoreDNS to our kubernetes cluster and we already have a nice dashboard in grafana[1]. We should be alerting on various things that may go awry on the coredns level as they can highly cause issues to services running in the clusters.

[1] https://grafana.wikimedia.org/d/-sq5te5Wk/kubernetes-dns?orgId=1