fix: Condition "Unknown" was shown for the condition without containing the status body

[kyasbal]

Some patch requests can omit its condition status and it was treated as Unknown condition and confusing with the explicit Unknown status

[gemini-code-assist]

Summary of Changes

Hello @kyasbal, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where Kubernetes condition statuses, when omitted in patch requests, were incorrectly interpreted as 'Unknown'. The change introduces a distinct state for these cases, improving the accuracy of condition reporting and preventing confusion with explicitly set 'Unknown' statuses. The update includes modifications to the condition state conversion logic and comprehensive test coverage to ensure correct behavior.

Highlights

• Condition Status Handling: Introduced a new RevisionStateConditionNoAvailableInfo enum value to accurately represent Kubernetes conditions where the status body is omitted, differentiating it from an explicit Unknown status.
• Logic Update: Modified the conditionStateToRevisionState function to correctly map an empty condition status string to the new RevisionStateConditionNoAvailableInfo.
• Test Enhancements: Refactored the test suite for condition history modification, introducing scenarios to thoroughly validate the new handling of omitted condition statuses and improve test organization.
• Timeline Sorting Logic: Updated the TimelineBuilder to compare ChangeTime directly for sorting revisions, replacing a previous comparison based on log indices.

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[gemini-code-assist]

Code Review

This pull request addresses a bug where a Kubernetes condition without a status field was incorrectly labeled as 'Unknown'. The fix introduces a new state, RevisionStateConditionNoAvailableInfo, for such cases, which is handled in the conditionStateToRevisionState function. The implementation is improved by converting an if-else chain to a switch statement for better readability. Additionally, the associated tests have been significantly refactored to use a scenario-based approach, which provides better testing for stateful logic, and a new test case has been added to cover the fix. A minor refactoring in timeline_builder.go improves consistency and efficiency. My feedback includes suggestions to improve the clarity of test case names for better maintainability.

[jyane]

Is this change related to the main concern of this PR?

[kyasbal]

I could say that is another bug but this is affecting same issue. The implicit "Unknown" condition generated in the previous version will be overwritten by later resource update and there was a bug in this case.

For example,

# manifest reconstructed from PATCH request 1 @ 2025-01-02T00:00:00Z
status:
  conditions:
    - type: Ready
      lastHeartbeatTime: "2025-01-02T00:00:00Z"
# manifest reconstructed from UPDATE request 2 @ 2025-01-03T00:00:00Z
metadata:
  creationTimestamp: "2025-01-01T00:00:00Z"
...(omit)
status:
  conditions:
    - type: Read
      status: "True"
      lastHeartbeatTime: "2025-01-03T00:00:00Z"

Then these creates following conditions revisions:

• At 2025-01-01T00:00:00Z: No enough information to determine the condition but we can infer the resource existence from the creationTimestamp field found in the 2nd request. (rev-1)
• At 2025-01-02T00:00:00Z: The condition information is not available because the PATCH request doesn't contain the status field under the condition. (rev-2)
• At 2025-01-03T00:00:00Z: The condition is changed to "True". (rev-3)

Revisions were sorted with associated log time stamp, it hides the new status written at rev-2 because these were wrongly sorted as rev2, rev1, rev3.
And the 1st revision and 2nd rectangle region becomes [2025-01-02T00:00:00Z, 2025-01-01T00:00:00Z)(rev-2). and [2025-01-01T00:00:00Z,2025-01-03T00:00:00Z)(rev-1). (Note the revision end time is the change time of the next revision element and this hides rev-2 by rendering rev-1 on it )
This bug was not a severe problem for the most of cases because revisions are written in chronological order. But this bug hides the new explicit "Unknown" status.

[jyane]

Thank you for your explanation, I think we need this fix as well.