pub const K8S_CLUSTER_UID: &str = "k8s.cluster.uid";Expand description
A pseudo-ID for the cluster, set to the UID of the kube-system namespace.
§Notes
K8s doesn’t have support for obtaining a cluster ID. If this is ever
added, we will recommend collecting the k8s.cluster.uid through the
official APIs. In the meantime, we are able to use the uid of the
kube-system namespace as a proxy for cluster ID. Read on for the
rationale.
Every object created in a K8s cluster is assigned a distinct UID. The
kube-system namespace is used by Kubernetes itself and will exist
for the lifetime of the cluster. Using the uid of the kube-system
namespace is a reasonable proxy for the K8s ClusterID as it will only
change if the cluster is rebuilt. Furthermore, Kubernetes UIDs are
UUIDs as standardized by
ISO/IEC 9834-8 and ITU-T X.667.
Which states:
] If generated according to one of the mechanisms defined in Rec. ] ITU-T X.667 | ISO/IEC 9834-8, a UUID is either guaranteed to be ] different from all other UUIDs generated before 3603 A.D., or is ] extremely likely to be different (depending on the mechanism chosen).
Therefore, UIDs between clusters should be extremely unlikely to conflict.
§Examples
"218fc5a9-a5f1-4b54-aa05-46717d0ab26d"