kubelet: fix fail to close kubelet->API connections on heartbeat failure #78016
What type of PR is this?
What this PR does / why we need it:
As discussed in kubernetes/client-go#374, another way to fix this is using http/2.0's ping frame to keep connection alive and identify failed connections. but it seems to be a long-term solution.
Which issue(s) this PR fixes:
Special notes for your reviewer:
related integration test is onging: #77957
Does this PR introduce a user-facing change?:
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Hi @gaorong. Thanks for your PR.
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