kube-state-metrics/docs/namespace-metrics.md

Namespace Metrics

Metric name	Metric type	Labels/tags	Status
kube_namespace_status_phase	Gauge	namespace=<namespace-name> status=<Active|Terminating>	STABLE
kube_namespace_labels	Gauge	namespace=<namespace-name> label_NS_LABEL=<NS_LABEL>	STABLE
kube_namespace_created	Gauge	namespace=<namespace-name>	STABLE