Check if there is a meaningful number of DNS queries before firing CoreDNSLoadUnbalanced.
#285
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Towards: giantswarm/roadmap#828
When enabling node local dns cache on a cluster, the load towards classic coredns pods is so low that it makes the Unbalanced alert fire. But in this scenario is not a problem at all, so with this PR we require at least a few requests to be made otherwise we don't fire the alert.
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oncall-kaas-cloudGitHub group).