magnum/releasenotes/notes/upgrade_api-1fecc206e5b0ef9...

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---
features:
- |
Cluster upgrade API supports upgrading specific nodegroups
in kubernetes clusters. If a user chooses a default nodegroup to
be upgraded, then both of the default nodegroups will be upgraded
since they are in one stack. For non-default nodegroups users are
allowed to use only the cluster template already set in the
cluster. This means that the cluster (default nodegroups) has to
be upgraded on the first hand. For now, the only label that is
taken into consideration during upgrades is the kube_tag. All
other labels are ignored.