OCPBUGS-65896: controllers: Prevent Progressing=True when scaling only

[tchap]

Before we start, the idea basically is to extend Sync to return conditions that would overwrite the conditions generated by the library-go machinery. The interface change is not yet implemented in library-go, but it should be OK as this operator is the only operator using the package.

---

To handle scaling properly, We need to keep some context regarding the state of the Deployment, so I decided to propose a few Deployment annotations. The names are not final, not sure about what the proper prefix is actually. Not sure whether there is a better way to store state, feel free to propose another way.

The main idea is summarized in the doc comment for ProcessDeployment:

// ProcessDeployment ensures the operator does not end up progressing on scaling.
// We define that scaling happens any time .spec.replicas is the only field that changes.
// The idea is then as follows:
//
//  1. When the replicas field is updated, store the change timestamp in a deployment annotation.
//  2. When the deployment eventually starts progressing, add another annotation so that we know it happened.
//  3. When the deployment hasn't progressing for too long, or it has finished progressing, remove all annotations.
//
// When the timestamp annotation is present, we should overwrite Progressing to be false.
//
// So, ProcessDeployment amends the expected deployment in place, also returning any conditions to set on the operator.

The annotation machinery is there to account for eventual consistency between creating/updating the deployment and the deployment controller picking the change up and actually updating the conditions there.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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Walkthrough

Adds scaling guardrail logic that annotates Deployments on replica changes and emits OperatorConditionApplyConfiguration overwrites; wires those overwrites through workload and controller call chains by extending several function signatures; adds a go.mod replace pointing github.com/openshift/library-go to a fork.

Changes

Cohort / File(s)	Summary
Module Dependencies go.mod	Adds // workload-condition-overwrites comment and a replace directing github.com/openshift/library-go to github.com/tchap/library-go v0.0.0-20260205162238-4ebccddf99eb.
Scaling implementation & tests pkg/controllers/common/scaling/scaling.go, pkg/controllers/common/scaling/scaling_test.go	Adds scaling guardrail functions (ProcessDeployment, specsEqualIgnoringReplicas, isDeploymentProgressing, cancelProgressing) that annotate/track replica changes and return condition-overwrites; adds extensive unit tests covering timing, annotation propagation, parsing errors, and progression logic.
Deployment controller pkg/controllers/deployment/deployment_controller.go	Extends Sync signature to return []*applyoperatorv1.OperatorConditionApplyConfiguration; fetches existing Deployment and invokes scaling.ProcessDeployment, propagating condition-overwrites through success and error paths.
Workload API & sync logic pkg/operator/workload/sync_openshift_oauth_apiserver.go	Adds conditionPrefix field to OAuthAPIServerWorkload, updates NewOAuthAPIServerWorkload constructor, and changes Sync/syncDeployment to return condition-overwrites alongside Deployment and errors; prefetches existing Deployment to run scaling logic.
Operator starter pkg/operator/starter.go	Introduces apiServerConditionsPrefix constant and passes it into NewOAuthAPIServerWorkload during workload construction.
Workload tests updated pkg/operator/workload/sync_openshift_oauth_apiserver_test.go	Wires a deployments lister via fake informers, adapts test setup to the new three-value return from syncDeployment (captures/ignores the new value), and adjusts comparisons accordingly.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

No actionable comments were generated in the recent review. 🎉

---

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tchap
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[tchap]

/retitle OCPBUGS-65896: controllers: Prevent Progressing=True when scaling only

We can only merge this after the library-go changes are merged.

/hold

[openshift-ci-robot]

@tchap: This pull request references Jira Issue OCPBUGS-65896, which is invalid:

• expected the bug to target the "4.22.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

This is a PoV, it doesn't build currently because of some changes needed in library-go.

Anyway, the idea basically is to extend Sync to return conditions that would overwrite the conditions generated by the library-go machinery.

We need to keep some context regarding the state of the Deployment, so I decided to propose a few annotations. The names are not final, not sure about what the proper prefix is actually. Not sure whether there is a better way to store state, feel free to propose another way.

The main idea is summarized in the doc comment for handleDeploymentScaling:

// handleDeploymentScaling ensures the operator does not end up progressing on scaling.
// We define that scaling happens any time .spec.replicas is the only field that changes.
// The idea is then as follows:
//
//  1. When the replicas field is updated, store the change timestamp in a deployment annotation.
//  2. When the deployment eventually starts progressing, add another annotation so that we know it happened.
//  3. When the deployment hasn't progressing for too long, or it has finished progressing, remove all annotations.
//
// When the timestamp annotation is present, we should overwrite Progressing to be false.

The annotation machinery is there to account for eventual consistency between creating/updating the deployment and the deployment controller picking the change up and actually updating the conditions there.

Also the current change is a PoC for a single controller, there is another controller to change basically in the same way. That refactoring should be pretty trivial.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[tchap]

/jira refresh

[openshift-ci-robot]

@tchap: This pull request references Jira Issue OCPBUGS-65896, which is valid. The bug has been moved to the POST state.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.22.0) matches configured target version for branch (4.22.0)
• bug is in the state New, which is one of the valid states (NEW, ASSIGNED, POST)

No GitHub users were found matching the public email listed for the QA contact in Jira (ksiddiqu@redhat.com), skipping review request.

Details

In response to this:

/jira refresh

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci-robot]

@tchap: This pull request references Jira Issue OCPBUGS-65896, which is valid.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.22.0) matches configured target version for branch (4.22.0)
• bug is in the state POST, which is one of the valid states (NEW, ASSIGNED, POST)

No GitHub users were found matching the public email listed for the QA contact in Jira (ksiddiqu@redhat.com), skipping review request.

Details

In response to this:

This is a PoV, it doesn't build currently because of some changes needed in library-go.

Anyway, the idea basically is to extend Sync to return conditions that would overwrite the conditions generated by the library-go machinery.

We need to keep some context regarding the state of the Deployment, so I decided to propose a few annotations. The names are not final, not sure about what the proper prefix is actually. Not sure whether there is a better way to store state, feel free to propose another way.

The main idea is summarized in the doc comment for ProcessDeployment:

// ProcessDeployment ensures the operator does not end up progressing on scaling.
// We define that scaling happens any time .spec.replicas is the only field that changes.
// The idea is then as follows:
//
//  1. When the replicas field is updated, store the change timestamp in a deployment annotation.
//  2. When the deployment eventually starts progressing, add another annotation so that we know it happened.
//  3. When the deployment hasn't progressing for too long, or it has finished progressing, remove all annotations.
//
// When the timestamp annotation is present, we should overwrite Progressing to be false.
//
// So, ProcessDeployment amends the expected deployment in place, also returning any conditions to set on the operator.

The annotation machinery is there to account for eventual consistency between creating/updating the deployment and the deployment controller picking the change up and actually updating the conditions there.

Also the current change is a PoC for a single controller, there is another controller to change basically in the same way. That refactoring should be pretty trivial.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@pkg/controllers/deployment/deployment_controller.go`:
- Around line 269-283: setRollingUpdateParameters mutates RollingUpdate fields
so scaling.ProcessDeployment sees non‑scaling diffs; to fix, normalize
RollingUpdate parameters before the scaling-only comparison by making a copy of
expectedDeployment (or a temp deployment) and setting its
Spec.Strategy.RollingUpdate to match
existingDeployment.Spec.Strategy.RollingUpdate (or nil) so only Replicas differ,
then call scaling.ProcessDeployment(existingDeployment, normalizedExpected,
...). Ensure you still use the original expectedDeployment for applying changes
but use the normalized copy for the conditionOverwrites call involving
setRollingUpdateParameters and scaling.ProcessDeployment.

[tchap]

I should add some tests here to also check the condition overwrites, I guess?

[tchap]

There are no tests for this package really, so I can't extend them really to make sure this works properly. For now only the scaling package is being tested properly.

[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@pkg/operator/workload/sync_openshift_oauth_apiserver.go`:
- Around line 287-297: Add a short comment above the call to
encryptionkms.AddKMSPluginVolumeAndMountToPodSpec explaining why the KMS
volume/mount is applied before calling scaling.ProcessDeployment (e.g., "KMS
volumes must be added before scaling detection so ProcessDeployment sees the
final podSpec and does not misattribute changes" or note that this ordering is
intentional to ensure KMS config is present when comparing specs), mirroring the
explanatory style used in deployment_controller.go; reference the functions
AddKMSPluginVolumeAndMountToPodSpec and scaling.ProcessDeployment in the comment
so future readers understand the rationale.

[openshift-ci]

@tchap: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-operator-serial-ote	933f489	link	false	/test e2e-aws-operator-serial-ote
ci/prow/e2e-aws-operator-parallel-ote	933f489	link	false	/test e2e-aws-operator-parallel-ote

Full PR test history. Your PR dashboard.

Details

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