The node e2e density tests have been failing consistently: https://k8s-testgrid.appspot.com/sig-node-kubelet#kubelet-serial-gce-e2e&include-filter-by-regex=create%20a%20batch%20of%20pods
The only PRs in the diff that touch the kubelet seem related to CNI: 88975e9...03cb11f, with the likely candidate being #51250
In the run prior to it failing, the latency ranged from 3s to 4s. In the first failing run, 50% percentile latency ranged from ~16s to ~19s, which is a major increase..

cc @kubernetes/sig-node-bugs @kubernetes/sig-network-bugs
cc @dixudx