Upgrade Kubernetes Clusters

"""
Kubernetes version 1.18 will not be supported starting Mar. 31, 2022. Upgrade your nodes to mitigate instability and security risks.

...

What do I need to do?

You can mitigate instability and security risks by manually upgrading your nodes from Kubernetes minor versions 1.18 and older to a supported version before March 31, 2022, when support for 1.18 ends.

The following clusters in your project are currently running an unsupported Kubernetes minor version. To resume support for these clusters, an upgrade to a supported version is required.

Apache Beam Testing: (apache-beam-testing)
io-datastores
metrics
metrics-staging
"""