k3s-io/k3s v1.21.7+k3s1

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This release updates Kubernetes to v1.21.7, and fixes a number of issues.

For more details on what's new, see the Kubernetes release notes.

Changes since v1.21.6+k3s1:

• Updated Kubernetes to v1.21.7 and containerd v1.4.12 (#4531, #4539)
• Rancher will no longer suggest upgrading the Traefik chart packaged with K3s. (#4559)
• Fix regression with cluster reset (#4524)
• Allow svclb pod to enable ipv6 forwarding (#4519)
• Backport new cniplugins and klipper-lb image version (#4515)
• Support for dual stack in serviceLB controller (#4503, #4513)
• Fixed an issue where config.yaml arguments with an equal sign would be skipped by server. (#4508)
• Unknown flags in config are now silently skipped by k3s server and etcd-snapshot (#4493)
• K3s now supports --etcd-arg to specify additional etcd arguments for running etcd (#4471)
• Increase agent's apiserver ready timeout (#4457)
• Rancher will no longer suggest upgrading the Traefik chart packaged with K3s. (#4326)
• Add ability to reconcile bootstrap data between datastore and disk (#4452)
• Fix log/reap reexec (#4376)
• Resolved an issue that would occasionally cause K3s to take more than a minute to schedule initial pods on the first server in a cluster. (#4363)

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