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[Backport release-1.6] fix(kubernetes): raise kubevirt-csi API client rate limits - #5055
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The kubevirt-csi controller built its infra- and tenant-cluster Kubernetes clients on a rest.Config that left QPS/Burst unset, so client-go applied its 5 QPS / 10 burst default. ControllerPublishVolume polls the infra PVC once per second for up to two minutes; when a tenant scales out and several volumes attach at once, the default limiter starves and the poll fails with "client rate limiter Wait returned an error: context deadline exceeded", which the tenant kubelet surfaces as FailedAttachVolume. Set QPS/Burst to 100/200, overridable via --kube-api-qps and --kube-api-burst, on both the infra and tenant configs so a concurrent-attach burst is admitted promptly. Reject non-positive flag values, which client-go would otherwise turn into the starving default (0) or unlimited (<0). Assisted-By: Claude <[email protected]> Signed-off-by: Aleksei Sviridkin <[email protected]> (cherry picked from commit 2dfe380)
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Description
Backport of #3428 to
release-1.6.