[release-1.9] 🌱Use inCluster kubeconfig if empty var provided #11885
+16
−7
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What this PR does / why we need it:
The current cluster_proxy behaves differently from what is expected for empty kubeconfig variables in kubectl load rules.
The behaviour forbids the usage of cluster proxy inside the pod in the cluster.
This checks the possibility of in-cluster configuration and keeps the same behaviour, which is not found.
/area testing
Cherry-pick of #11865 commit to release-1.9