StatChannelStatus:
    | "ok"
    | "cluster-unreachable"
    | "not-checked"
    | "channel-missing"
    | "missing-permissions"

Why a counter is or is not updating.

cluster-unreachable and not-checked are NOT evidence that a channel is gone - they mean the lookup could not be made. A panel that offers a delete control off channel-missing must check inspected first, or it will invite somebody to remove a working configuration.