Enhance cluster upgrade overview with detailed process#4300
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Clarified the process of upgrading management servers and compute servers during the runtime upgrade. Added details about the EnableRepurposeSpareKcpNode feature and its impact on control plane nodes.
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Pull request overview
This PR updates the Azure Operator Nexus cluster runtime upgrade overview documentation to better describe observed upgrade behavior when the EnableRepurposeSpareKcpNode feature is enabled, specifically around how spare/control-plane capacity is handled during the management/control-plane portion of the upgrade.
Changes:
- Added a new note describing how a management-plane node may be temporarily promoted to spare control-plane role when
EnableRepurposeSpareKcpNodeis enabled. - Clarified expected state transitions around the spare control-plane node during the control-plane upgrade phase.
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| > [!Note] | ||
| > Customers may observe the spare server with a different runtime version. This is expected. | ||
| > If the EnableRepurposeSpareKcpNode feature is enabled, a healthy management plane node is first promoted to a spare control plane node before the control plane upgrade begins. After all control plane nodes are upgraded, the spare control plane node is converted back to a management plane node. |
Clarified the process of upgrading management servers and compute servers during the runtime upgrade. Added details about the EnableRepurposeSpareKcpNode feature and its impact on control plane nodes.
Add changes in Upgrade behavior observed due to EnableRepurposeSpareKcpNode feature.