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Stop flooding the kube-proxy logs on dual-stack because of IPFamily #88934
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It also adds unit tests to the metaproxier package.
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The kube-proxy metaproxier implementations tries to get the IPFamily from the endpoints, but if the endpoints doesn't contains an IP address it logs a Warning. This causes that services without endpoints keep flooding the logs with warnings. We log this errors with a level of Verbosity of 4 instead of a Warning
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