Release notes can be found at https://docs.projectcalico.org/archive/v3.21/release-notes/
Attached to this release are the following artifacts:
release-vv3.21.0.tgz: docker images and kubernetes manifests.calico-windows-vv3.21.0.zip: Calico for Windows.tigera-operator-vv3.21.0-0.tgz: Calico helm v3 chart.