Add documentation around releases

CONTRIBUTING.md

@@ -63,6 +63,17 @@ To commit code, you should:
 * Add or modify existing tests related to code changes being submitted
 * Run and ensure that local tests pass before submitting a merge request
 
+## Release Process and Version Support
+
+* **Release Cadence**: ~2 months (volunteer dependent)
+* **Version Support**: Latest release plus N-1 through N-4 receive critical fixes; N-5+ unsupported
+* **Trunk**: Not stable - never use in production
+* **Testing**: Extended RC periods with community testing
+
+Details:
+* [Release Process Documentation](presto-docs/src/main/sphinx/develop/release-process.rst) - For developers
+* [Version Support Guide](presto-docs/src/main/sphinx/admin/version-support.rst) - For administrators
+
 ## Designing Your Code
 * Consider your code through 3 axes
     1. Code Quality and Maintainability, for example:

presto-docs/src/main/sphinx/admin.rst

@@ -20,3 +20,4 @@ Administration
     admin/spark
     admin/verifier
     admin/grafana-cloud
+    admin/version-support

presto-docs/src/main/sphinx/admin/version-support.rst

@@ -0,0 +1,230 @@
+===============
+Version Support
+===============
+
+Overview
+--------
+
+Presto is maintained by volunteers. This document describes which versions receive support and what level of support to expect.
+
+Support Philosophy
+------------------
+
+* Data correctness issues are taken extremely seriously and typically fixed quickly
+* Runtime bugs and security vulnerabilities are prioritized and addressed promptly
+* Support depends on volunteer availability - no formal SLAs
+* Users are encouraged to contribute fixes for issues affecting them
+
+.. _current-version-support:
+
+Current Version Support
+-----------------------
+
+**Latest Release**
+   * Primary focus for bug fixes
+   * Recommended for new deployments after testing
+
+**Past 4 Releases (N-1 through N-4)**
+   * Critical fixes only when:
+
+     - Data correctness issues are found
+     - Volunteers are available to backport
+
+   * Patch releases for severe issues only
+   * Support decreases with age
+
+**Older Releases (N-5 and earlier)**
+   * Not supported
+   * Exceptions only when:
+
+     - Volunteer provides the backport
+     - Fix applies cleanly
+     - Testing is available
+
+   * Upgrade required
+
+**Trunk/Master Branch**
+   * Development branch
+   * **Never use in production**
+   * Contains experimental features and bugs
+   * For testing upcoming changes only
+
+**Edge Releases**
+   * Weekly builds from master
+   * **Never use in production**
+   * **Not supported** - no fixes provided
+   * For testing upcoming features
+
+Support Lifecycle
+-----------------
+
+Timeframes are approximate and depend on volunteer availability.
+
+A typical release follows this lifecycle:
+
+1. **Release Candidates** (2-4 weeks)
+
+   - One RC version per release
+   - Active bug fixing with fixes verified in the existing RC
+   - High community engagement
+
+2. **Current Release** (approximately 2 months)
+
+   - Primary focus for bug fixes
+   - Active monitoring for issues
+   - Most community attention
+
+3. **Supported Releases** (N-1 through N-4, approximately 8 months)
+
+   - Critical fixes only
+   - Progressively reduced community focus
+   - Patch releases for severe issues become less likely with age
+
+4. **Archived** (N-5 and older)
+
+   - No active support
+   - Users strongly encouraged to upgrade
+   - See :ref:`current-version-support` for details
+
+Types of Support
+----------------
+
+**Bug Fixes**
+   Highest priority (typically fixed very quickly):
+
+   * Data correctness issues - taken extremely seriously
+
+   High priority:
+
+   * Runtime bugs and crashes
+   * Severe performance regressions
+
+   Lower priority:
+
+   * Minor performance issues
+   * UI/cosmetic problems
+   * Feature enhancements
+
+**Security Vulnerabilities**
+   * Upgrade to latest release (default recommendation)
+   * Patches for N-1 through N-4 available upon request
+   * Backport availability depends on volunteers and severity
+   * Plan to upgrade rather than rely on backports
+
+**Documentation**
+   * Release notes and full documentation for all versions remain available
+   * Migration guides for major changes
+   * Community-contributed upgrade experiences
+
+Getting Support
+---------------
+
+**Community Channels**
+
+* `Presto Slack <https://communityinviter.com/apps/prestodb/prestodb>`_ - Real-time community discussion
+* `GitHub Issues <https://github.com/prestodb/presto/issues>`_ - Bug reports and feature requests
+* `Mailing List <https://lists.prestodb.io/g/presto-dev>`_ - Development discussions
+
+**Self-Support Resources**
+
+* Release notes and documentation
+* Community Slack search history
+* GitHub issues and pull requests
+* Stack Overflow questions tagged 'presto'
+
+Recommendations for Production Use
+----------------------------------
+
+**Version Selection**
+
+1. **For new deployments**: Use the latest stable release after thorough testing
+2. **For existing deployments**: Stay within 4 versions of the latest release
+3. **For conservative environments**: Wait for at least one patch release (if any) before upgrading
+4. **Never use trunk/master or edge** in production
+
+**Upgrade Strategy**
+
+* Plan regular upgrades (every 2-4 months)
+* Test thoroughly in staging environments
+* Monitor community channels for known issues
+* Maintain ability to rollback if needed
+* Consider skipping releases if stable (but don't fall too far behind)
+
+**Risk Mitigation**
+
+* Maintain test environments matching production
+* Participate in release candidate testing
+* Monitor community discussions for your version
+* Contribute test cases for critical workflows
+
+Contributing to Support
+-----------------------
+
+Ways to contribute:
+
+**Report Issues**
+   * File detailed bug reports with reproduction steps on `GitHub Issues <https://github.com/prestodb/presto/issues>`_
+   * Test fixes and provide feedback
+   * Share workarounds with the community
+
+**Contribute Fixes**
+   * Submit `pull requests <https://github.com/prestodb/presto/pulls>`_ for bugs affecting you
+   * Help review and test others' fixes
+   * Backport critical fixes to versions you use
+
+**Share Knowledge**
+   * Document upgrade experiences
+   * Answer questions in `Presto Slack <https://communityinviter.com/apps/prestodb/prestodb>`_
+   * Write blog posts about solutions
+   * Contribute to `documentation <https://github.com/prestodb/presto/tree/master/presto-docs>`_
+
+**Sponsor Development**
+   * Allocate engineering resources to the project
+   * Fund specific feature development
+   * Support maintainers and release shepherds
+
+Special Considerations
+----------------------
+
+**Long-Term Support (LTS)**
+   * Not available
+   * Volunteer model incompatible with LTS commitments
+
+**End-of-Life Announcements**
+   * No formal EOL process
+   * Versions become unsupported as community moves forward
+   * Check release announcements for migration guidance
+
+**Compatibility**
+   * Breaking changes documented in release notes
+   * Migration guides provided for major changes
+   * Test when upgrading across multiple versions
+
+Support Expectations
+--------------------
+
+**Available:**
+
+* Typically quick response to data correctness and runtime bugs
+* Priority focus on critical issues
+* Active community troubleshooting help
+* Transparency about known issues
+* Documentation for old versions
+
+**Not Available:**
+
+* Guaranteed response times
+* Fixes for all issues
+* Support for old versions
+* Feature backports
+* 24/7 support
+
+Summary
+-------
+
+Running Presto in production requires:
+
+* Regular upgrades (every 2-4 months)
+* Thorough testing before deploying
+* Understanding that support is volunteer-based
+* Contributing fixes for issues you encounter

presto-docs/src/main/sphinx/develop.rst

@@ -22,3 +22,4 @@ This guide is intended for Presto contributors and plugin developers.
     develop/presto-console
     develop/presto-authenticator
     develop/client-request-filter
+    develop/release-process