Function zones_configured_on_instance 

pub fn zones_configured_on_instance(
    zones: &[DNSZone],
    instance_namespace: &str,
    instance_name: &str,
) -> Vec<(String, String)>

Returns the zones that are configured on a given Bind9Instance.

Used by the DNSZone controller’s Endpoints watch: an Endpoints object is named after the instance’s Service, and it changes exactly when the set of ready BIND9 pods for that instance changes - a pod being replaced, a Deployment being rolled, a node draining. That is precisely when a zone may have disappeared from a server and must be reconciled, so this maps the instance back to every zone that expects to be served by it.

Matching is done against status.bind9Instances, the authoritative record of which instances a zone has been configured on.

Arguments

• zones - The zones to search (typically the reflector store contents)
• instance_namespace - Namespace of the instance whose pods changed
• instance_name - Name of the instance whose pods changed

Returns

(namespace, name) of every zone configured on that instance.