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dbf780a48a
If kube-apiservers run at a different version (during upgrades) and each has different opinion on what the `extension-apiserver-authentication` config map should look like, they would start dueling with config map writes. This commit removes handling of the update events of the target CM in order to reduce the amount of such dueling to once a minute, as the controller is guaranteed to run at least once a minute anyway. The idea is that a cluster state with two different versions of kube-apiserver should never be permanent, and so a reduced amount of dueling for that period is tolerable.