WIP: [Feat] Support StormService pause rollout in upgrade

[Jeffwan]

Pull Request Description

[Please provide a clear and concise description of your changes here]

Related Issues

Resolves: #[Insert issue number(s)]

Important: Before submitting, please complete the description above and review the checklist below.

---

Contribution Guidelines (Expand for Details)

We appreciate your contribution to aibrix! To ensure a smooth review process and maintain high code quality, please adhere to the following guidelines:

Pull Request Title Format

Your PR title should start with one of these prefixes to indicate the nature of the change:

• [Bug]: Corrections to existing functionality
• [CI]: Changes to build process or CI pipeline
• [Docs]: Updates or additions to documentation
• [API]: Modifications to aibrix's API or interface
• [CLI]: Changes or additions to the Command Line Interface
• [Misc]: For changes not covered above (use sparingly)

Note: For changes spanning multiple categories, use multiple prefixes in order of importance.

Submission Checklist

• [ ] PR title includes appropriate prefix(es)
• [ ] Changes are clearly explained in the PR description
• [ ] New and existing tests pass successfully
• [ ] Code adheres to project style and best practices
• [ ] Documentation updated to reflect changes (if applicable)
• [ ] Thorough testing completed, no regressions introduced

By submitting this PR, you confirm that you've read these guidelines and your changes align with the project's contribution standards.

[gemini-code-assist[bot]]

Summary of Changes

Hello @Jeffwan, I'm Gemini Code Assist[^1]! 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 introduces a robust canary deployment mechanism for StormService resources, providing fine-grained control over application upgrades. It allows users to define a sequence of steps for gradually shifting traffic to new versions and to strategically pause the rollout for validation or manual checks. This feature significantly enhances the safety and flexibility of deploying changes to StormService-managed applications.

Highlights

• Canary Deployment Strategy: Introduced a new CanaryUpdateStrategy for StormService resources, enabling gradual rollouts with defined steps for traffic shifting and pauses.
• Pause Rollout Support: Added functionality to pause canary deployments, allowing for manual intervention or timed pauses during an upgrade process.
• API and CRD Extensions: Extended the StormService API with new types like CanaryStatus, CanaryStep, and PauseStep, along with corresponding CRD schema updates and deepcopy implementations.
• Controller Logic Integration: Integrated the canary deployment logic into the StormService controller's reconciliation loop, including handling of scaling, rollout constraints (maxUnavailable/maxSurge), and status updates during canary phases.
• Enhanced Testing and Samples: Added comprehensive unit and integration tests for the new canary features, along with sample YAML configurations for both pooled and replica mode canary deployments.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with :thumbsup: and :thumbsdown: on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

[^1]: Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution.