FindConfigMapVolume returns the configmap which's name matches the predicate in a PodSpec, empty indicates not found.

SetStatefulSetLastAppliedConfigAnnotation set last applied config to Statefulset's annotation.

SetUpgradePartition set statefulSet's rolling update partition.

StatefulSetEqual compares the new Statefulset's spec with old Statefulset's last applied config.

StatefulSetIsUpgrading confirms whether the statefulSet is upgrading phase.

UpdateConfigMapIfNeed set the toml field as the old one if they are logically equal.

UpdateStatefulSet is a template function to update the statefulset of components.

UpdateStatefulSetWithPreCheck todo: impl this logic.

LastAppliedConfigAnnotation is annotation key of last applied configuration.