docs: Add comprehensive documentation, examples, and project roadmap

[Shahab96]

Summary

This PR adds comprehensive documentation, reorganizes examples, and establishes a project roadmap to guide development toward v1.0. These additions provide critical architectural understanding, prevent common misconfigurations, and create a foundation for community discussion.

Changes

📚 Documentation (docs/)

• architecture-decisions.md (469 lines)

  • Documents RustFS unified cluster architecture
  • Explains erasure coding behavior and data distribution
  • Clarifies valid vs invalid multi-pool use cases
  • Warns about storage class mixing pitfalls

• multi-pool-use-cases.md (430 lines)

  • Comprehensive guide for multi-pool scenarios
  • Valid use cases: capacity expansion, geographic distribution, spot instances, hardware migration
  • Anti-patterns to avoid with detailed explanations
  • Real-world examples and best practices

• DEVELOPMENT-NOTES.md (224 lines)

  • Development workflow and build commands
  • Testing procedures and contribution guidelines
  • Code organization and architecture overview

📋 Examples Reorganization

Moved examples from deploy/rustfs-operator/examples/ to project root examples/ for better visibility.

New Examples Added:

• cluster-expansion-tenant.yaml - Capacity expansion and hardware migration
• geographic-pools-tenant.yaml - Multi-region deployment with topology constraints
• hardware-pools-tenant.yaml - Heterogeneous disk sizes (same storage class)
• spot-instance-tenant.yaml - Cost optimization using spot instances
• production-ha-tenant.yaml - Production HA with topology spread constraints
• README.md - Comprehensive usage guide with kubectl verification commands

Enhanced Existing Examples:

• simple-tenant.yaml - Added scheduling field documentation
• minimal-dev-tenant.yaml - Corrected port references
• custom-rbac-tenant.yaml - Clarified RBAC patterns
• multi-pool-tenant.yaml - Fixed syntax and structure

All examples include:

• Inline documentation explaining configuration choices
• Architectural warnings about RustFS behavior
• kubectl verification commands
• Production best practices

📝 CHANGELOG.md (175 lines)

Following Keep a Changelog format:

• Documents all changes from v0.1.0 through unreleased features
• Multi-pool scheduling enhancements (2025-11-08)
• Critical port corrections (console: 9090→9001, IO: 90→9000)
• Volume path standardization (/data/{N} → /data/rustfs{N})
• Architecture corrections and clarifications
• Verification against RustFS source code, Helm charts, and official docs

🗺️ ROADMAP.md (346 lines)

Establishes clear development path toward v1.0:

• Core Stability

  • Secret-based credential management
  • Status condition management
  • StatefulSet update/rollout management
  • Integration tests

• Advanced Features

  • Tenant lifecycle management with finalizers
  • Pool lifecycle operations (add/remove/scale)
  • TLS/certificate automation
  • Monitoring and alerting

• Enterprise Features

  • Multi-tenancy enhancements
  • Security hardening (Pod Security Standards)
  • Compliance and audit logging
  • Advanced networking

• Production Ready

  • 95%+ test coverage
  • Complete documentation
  • Ecosystem integration (OperatorHub, Helm)
  • Community support channels

Also includes:

• Technical debt tracking
• Community contribution goals
• Success metrics
• Release schedule (quarterly pre-1.0, monthly post-1.0)

Statistics

• 16 files changed: 3,879 insertions(+), 31 deletions(-)
• New documentation: ~3,900 lines
• New examples: 8 comprehensive YAML files
• Commits: 4 well-organized commits

Testing

• Documentation reviewed for accuracy against RustFS source
• Examples validated for correct Kubernetes syntax
• All examples include verification commands
• No code changes - documentation only

Impact

• ✅ Prevents common misconfigurations through architecture docs
• ✅ Accelerates new user onboarding with comprehensive examples
• ✅ Establishes clear project direction with roadmap
• ✅ Creates foundation for community contribution
• ✅ 100% backward compatible (no breaking changes)

Discussion Points

This PR is intended to facilitate discussion around:

1. Roadmap priorities - Are the proposed features and timeline reasonable?
2. Example coverage - Are there additional use cases we should document?
3. Architecture understanding - Any corrections or clarifications needed?
4. Community goals - How can we best support contributors?

Feedback welcome on all aspects! 🙏

[bestgopher]

Is this ready to be merged?

[Shahab96]

Is this ready to be merged?

Yes