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Automatic merge from submit-queue Allow empty annotation values Related downstream issue: https://github.com/openshift/origin/issues/11175 **Release note**: ```release-note release-note-none ``` Annotations with empty values can be used, for example, in diagnostics logging. This patch removes the client-side check for empty values in an annotation key-value pair. **Before** ``` $ kubectl annotate pod zookeeper-1 node-selector="" --overwrite error: invalid annotation format: node-selector= ``` **After** ``` $ kubectl annotate pod zookeeper-1 node-selector="" --overwrite pod "zookeper-1" annotated ``` ``` $ kubectl get po/zookeeper-1 --template='{{.metadata.annotations}}' map[... node-selector: test-label:test] ``` @fabianofranz @liggitt