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The v0.0.19 Konnectivity client includes several significant fixes to prevent the GRPC tunnel between the KAS and the APIServer Network Proxy from becoming blocked/wedged. Importantly it picks up the fix for kubernetes-sigs/apiserver-network-proxy#167. We believe this will also fix many of the failures currently seen on https://testgrid.k8s.io/sig-api-machinery-network-proxy#ci-kubernetes-e2e-gci-gce-network-proxy-grpc&width=5.
GCE Cluster addons
These cluster add-ons are specific to GCE and GKE clusters. The GCE-specific addon directory is merged with the general cluster addon directory at release, so addon paths (relative to the addon directory) must be unique across the 2 directory structures.
More details on addons in general can be found here.