Backport of heartbeat: use leader's ACL token when failing heartbeat into release/1.9.x #24248
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Backport
This PR is auto-generated from #24241 to be assessed for backporting due to the inclusion of the label backport/1.9.x.
The below text is copied from the body of the original PR.
In #23838 we updated the
Node.UpdateRPC handler we use for heartbeats to be more strict about requiring node secrets. But when a node goes down, it's the leader that sends the request to mark the node down viaNode.Update(to itself), and this request was missing the leader ACL needed to authenticate to itself.Add the leader ACL to the request and update the RPC handler test for disconnected-clients to use ACLs, which would have detected this bug. Also added a note to the
Authenticatecomment about how that authentication path requires the leader ACL.Fixes: #24231
Ref: https://hashicorp.atlassian.net/browse/NET-11384
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