IsPodAvailable returns true if a pod is available; false otherwise.

IsPodReady returns true if a pod is ready; false otherwise.

VisitContainers invokes the visitor function with a pointer to every container spec in the given pod spec with type set in mask.

AllContainers specifies that all containers be visited.

Containers is for normal containers.

EphemeralContainers is for ephemeral containers.

InitContainers is for init containers.

ActivePods type allows custom sorting of pods so a controller can pick the best ones to delete.

ByLogging allows custom sorting of pods so the best one can be picked for getting its logs.

ContainerType signifies container type.

ContainerVisitor is called with each container spec, and returns true if visiting should continue.