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Bug 1954481

Summary: 4.8 lacks v1alpha1 flowschema support, WAS: Unable to apply (flowcontrol.apiserver.k8s.io/v1alpha1, Kind=FlowSchema) /openshift-sdn due to missing related FlowSchema
Product: OpenShift Container Platform Reporter: Stefan Schimanski <sttts>
Component: kube-apiserverAssignee: Maciej Szulik <maszulik>
Status: CLOSED WONTFIX QA Contact: Ke Wang <kewang>
Severity: high Docs Contact:
Priority: high    
Version: 4.8CC: akashem, aos-bugs, kewang, mfojtik, sttts, xxia
Target Milestone: ---   
Target Release: 4.8.0   
Hardware: Unspecified   
OS: Unspecified   
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Clone Of: 1954420 Environment:
Last Closed: 2021-04-28 13:26:40 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Comment 1 Stefan Schimanski 2021-04-28 08:52:04 UTC 
Compare https://bugzilla.redhat.com/show_bug.cgi?id=1913399#c1 where we described our plan to keep v1alpha1 support in 4.8 for smooth upgrades.
Comment 2 Maciej Szulik 2021-04-28 13:26:40 UTC 
flowcontrol.apiserver.k8s.io/v1alpha1 API was deprecated in k8s 1.20 (OCP 4.7) with replacement v1beta1 available [1].
In k8s 1.21 (OCP 4.8) that API is entirely removed and can't be easily turned back due to the mechanisms implemented 
upstream disabling removed API. 

[1] https://github.com/kubernetes/kubernetes/blob/release-1.21/staging/src/k8s.io/api/flowcontrol/v1alpha1/types.go#L63-L66