LTS Process Overview

A modular, maintainable process for Long-Term Support (LTS) management covering: request intake, triage, patch development, testing & validation, release, and communication. Components are defined as independent services/roles with clear inputs, outputs, owners, and interfaces.

• Goals
• High-level Flow (summary)
• Roles & Responsibilities
• Modular Components (for implementation)
• Decision Points & Policies
• Data Model / Ticket Fields (recommended)
• Branching & Versioning Strategy (concise)
• CI/CD Gates (must-have)
• Rollback & Emergency Procedures
• Communication Templates (short)
• Observability & Auditing
• Automation Recommendations
• Example Minimal Workflow (concrete)
• Implementation Checklist (actionable)
• Suggested Documentation Structure (for the final doc)
• LTS Process & Runbook
  • Purpose & scope
  • Roles & responsibilities
  • High-level end-to-end flow
  • Decision matrices & SLAs
  • Detailed module descriptions
  • Branching, versioning & tagging rules
  • CI/CD & testing requirements
  • Release & rollback procedures
  • Communication templates
  • Ticket & data model (fields)
  • Observability & auditing
  • Automation recommendations
  • Runbooks (concise, actionable)
  • Example minimal workflow (concrete)
  • Implementation checklist
  • Glossary & FAQ

Goals

• Fast, predictable handling of LTS requests.
• Clear ownership at each step.
• Reusable, testable modules (automation where possible).
• Auditability and traceability.

High-level Flow (summary)

1. Request intake (ticket created)
2. Triage (severity, scope, risk, SLA)
3. Patch planning (backport feasibility, approver)
4. Patch development (branching, CI)
5. QA & validation (automated + manual tests)
6. Release staging (artifact build, signing)
7. Release & deployment (channels: repo, packages)
8. Post-release verification & rollback plan
9. Communication & documentation
10. Postmortem and metrics

Roles & Responsibilities

• Requester: reports issue/need.
• Triage Engineer: assesses severity & scope.
• Maintainer/Developer: implements patch.
• QA Engineer: validates changes.
• Release Manager: builds and publishes artifacts.
• Security/Compliance: reviews if security-sensitive.
• Communications Lead: prepares release notes & announcements.
• Automation/CI Owner: maintains pipelines, tests.

Modular Components (for implementation)

1. Intake Module
   • Inputs: user issue report (bug, CVE, feature-safe change).
   • Outputs: standardized ticket with metadata.
   • Mechanisms: issue template; automated enrichment (git metadata, environment, reproducible steps, stack traces).
   • Owner: triage team.
   • Interfaces: ticketing system API, email, webhook.
2. Triage Module
   • Inputs: ticket.
   • Outputs: priority, SLA deadline, decision (backport, defer, reject), assigned owner.
   • Decision criteria: severity (blocker/critical/high/medium/low), affected versions, exploitability, workaround availability, dependency constraints.
   • Artefacts: triage checklist, risk score, initial patch scope.
   • Owner: senior engineer/triage rotation.
   • Interfaces: ticket updates, vulnerability database, release calendar.
3. Planning & Approval Module
   • Inputs: triage decision, risk score.
   • Outputs: backport plan (target versions, branching strategy), approvers list, estimated effort, security review required flag.
   • Policies: only approved maintainers can sign off; emergency fast-track defined.
   • Artefacts: approval ticket/state, planned branch names, milestone.
4. Development Module
   • Inputs: backport plan, target branches.
   • Outputs: patch branches, commits, automated CI results.
   • Conventions: branch naming (lts//issue-), commit message template (including ticket id and changelog line), tests added/updated.
   • Automation: pre-commit checks, unit/integration CI, static analysis, dependency checks.
   • Owner: implementer + code reviewer.
   • Interfaces: source repo, CI runners, code-review system.
5. Testing & Validation Module
   • Inputs: merge request/PR.
   • Outputs: test reports, signed-off status, regression checklist results.
   • Tests: unit, integration, regression for affected features, upgrade/downgrade tests, performance baseline checks, security regression.
   • Validation gating: must pass automated tests + at least one QA sign-off (or policy exception).
   • Owner: QA, security when applicable.
   • Interfaces: test orchestration system, test data, environment provisioning.
6. Release Staging Module
   • Inputs: merged patches in LTS branches.
   • Outputs: build artifacts (packages, containers), checksums, signatures, release candidate (RC).
   • Steps: build reproducible artifacts, run smoke tests, external dependency verification.
   • Artefacts: build manifest, SBOM if required.
   • Owner: Release Manager + CI Owner.
   • Interfaces: artifact storage, signing keys store, package registries.
7. Release & Deployment Module
   • Inputs: RC approval.
   • Outputs: published artifacts to LTS channels, release notes, update metadata.
   • Channels: package repo (PyPI/internal), container registry, OS packages, downloadable release page.
   • Controls: staged rollout (canaries), versioning policy (semantic + LTS modifier), rollback procedure.
   • Owner: Release Manager + Ops.
   • Interfaces: CD pipelines, monitoring, package registries.
8. Communication & Documentation Module
   • Inputs: release artifacts, changelog, security advisories.
   • Outputs: release notes, security bulletin (if applicable), internal status update, external announcement.
   • Templates: short/technical release notes, user upgrade guidance, migration notes.
   • Owners: Communications Lead + Maintainer.
   • Interfaces: mailing lists, status page, docs site, social channels.
9. Post-release & Metrics Module
   • Inputs: deployment telemetry, incident reports.
   • Outputs: verification report, incident tickets if regressions, postmortem.
   • Metrics: time-to-triage, time-to-release, rollback rate, test pass rate, adoption of LTS releases.
   • Owner: SRE/Engineering leadership.
   • Interfaces: monitoring dashboards, metrics systems.

Decision Points & Policies

• Backport eligibility: bug fix vs. feature; security fix → high priority; API-breaking changes disallowed in LTS unless emergency.
• Semantic versioning: patch releases only (no minor/major changes) unless explicitly approved.
• Time SLAs: triage within 24 hours (critical: 4 hours), patch plan within 3 business days, release within SLA window depending on severity.
• Approval matrix: security-sensitive must have Security sign-off; critical regressions require product owner + engineering lead approval.

Data Model / Ticket Fields (recommended)

• Ticket ID, Reporter
• Affected versions (list)
• Severity (enum)
• CVE ID (if applicable)
• Repro Steps + Testcase
• Proposed patch branch
• Target LTS branches
• Triage owner & date
• Estimated effort
• Approvals (list with timestamps)
• Release versions & artifacts
• Post-release notes

Branching & Versioning Strategy (concise)

• Main development: main (or trunk).
• LTS branches: release-lts/vX.Y (only patch commits).
• Patch branch: lts/vX.Y/issue-
• Merge flow: PR to LTS branch → after CI+QA, merge; then optionally back-merge to main if fix is relevant.
• Tagging: vX.Y.Z-lts or vX.Y.Z (use stable, consistent tags); include build metadata.

CI/CD Gates (must-have)

• Lint + static analysis
• Unit + integration
• Backport-specific regression suite
• Security scan (dependency, SAST)
• Artifact signing step
• Canary deployment + automated health checks (for server-side components)

Rollback & Emergency Procedures

• Predefine rollback commands and scripts per platform.
• Keep previous artifact in registry and mark as “safe”.
• Time-limited automatic rollback if critical health checks fail.
• Emergency fast-track: skip non-essential processes but require post-facto audit and mandatory postmortem.

Communication Templates (short)

• Release Note: 1–2 line summary, affected versions, upgrade instructions, link to full changelog.
• Security Advisory: severity, CVE, impact, mitigation, upgrade method, contact.
• Internal Status: release time, success/failure, known issues, rollback status.

Observability & Auditing

• Log every state transition for ticket (who/when/why).
• Store immutable build manifests and signatures.
• Enable telemetry on adoption and errors post-release.
• Retain audit logs for policy/compliance retention period.

Automation Recommendations

• Automate ticket creation from monitoring alerts and CVE feeds.
• Auto-populate ticket metadata via CI/webhooks.
• Release pipelines: parameterized for target LTS versions.
• Auto-generate changelogs from commit metadata.
• Use feature flags or phased rollout utilities for safer releases.

Example Minimal Workflow (concrete)

1. Issue opened with template → Intake Module enriches and assigns.
2. Triage Engineer marks severity = high → creates backport plan targeting release-lts/v1.4 and v1.3; security review flagged.
3. Developer creates branch lts/v1.4/issue-123, adds tests; CI runs; PR created.
4. QA runs regression suite; Security runs SAST. All pass → approvals recorded.
5. Release Manager runs staging build → artifact signed and smoke-tested.
6. Publish to LTS channel with release note; communications sent.
7. Monitor metrics for 48 hours; no issues → close ticket; update changelog and postmortem if anything notable.

Implementation Checklist (actionable)

• Create issue templates and ticket fields.
• Define triage checklist & severity rubric.
• Implement branching policy and naming conventions.
• Build CI jobs for backport branches and regression suite.
• Implement artifact signing and storage.
• Create release automation with staged rollouts.
• Create communication templates and docs pages.
• Instrument metrics and dashboards.
• Document rollback scripts and emergency path.
• Schedule periodic drills for emergency releases/rollbacks.

Suggested Documentation Structure (for the final doc)

1. Purpose & scope
2. Roles & responsibilities
3. End-to-end flow diagram (visual)
4. Detailed module descriptions (as above)
5. Decision matrices & SLAs
6. Branching, versioning, tagging rules
7. CI/CD and testing requirements
8. Release & rollback procedures
9. Communication templates
10. Metrics & audit logging
11. Runbooks & emergency drills
12. Glossary & FAQs

---

<?xml version=”1.0” encoding=”UTF-8” standalone=”no”?>

---

LTS Process & Runbook

Purpose & scope

Provide a modular, maintainable process for managing Long-Term Support (LTS) changes: intake, triage, planning/approval, patch development, testing & validation, release staging, release & deployment, communication, and post-release. Applies to production-critical Python project components that receive LTS patch releases.

Roles & responsibilities

• Requester: reports issues; provides reproduction, logs, environment.
• Triage Engineer: assesses severity, affected versions, assigns owner, sets SLA.
• Maintainer / Developer: implements backport patch and tests.
• Code Reviewer: verifies correctness and compatibility.
• QA Engineer: validates changes via automated and manual tests.
• Security Reviewer: required for security-sensitive fixes.
• Release Manager: builds, signs, stages, and publishes artifacts; coordinates rollout/rollback.
• Ops / SRE: runs deployments, monitors health, executes rollback if needed.
• Communications Lead: prepares release notes, advisories, internal/external comms.
• Automation/CI Owner: maintains pipelines and test suites.
• Engineering Leadership: approves emergency exceptions and policy changes.

High-level end-to-end flow

1. Intake (ticket created/enriched)
2. Triage (severity, scope, SLA)
3. Planning & Approval (backport targets, approvers)
4. Development (branching, commits, CI)
5. Testing & Validation (automated + manual)
6. Release Staging (build artifacts, signing)
7. Release & Deployment (publish, staged rollout)
8. Communication & Documentation (release notes/advisories)
9. Post-release verification & metrics
10. Postmortem if incidents occur

Decision matrices & SLAs

• Severity mapping:
  • Critical: service down, data loss, remote code execution — triage within 4 hours.
  • High: major functionality broken, security exploitability — triage within 24 hours.
  • Medium/Low: minor bug or enhancement — triage within 3 business days.
• Backport eligibility:
  • Security fixes → always considered for all supported LTS branches.
  • Bug fixes → considered if fix is low-risk and patchable without API breaks.
  • Feature requests → generally deferred; only included if trivial and low risk.
• Versioning policy:
  • LTS releases are patch-only (increment Z in X.Y.Z). No minors/majors in LTS without explicit approval.
• Timeline examples:
  • Triage done → plan within 3 business days.
  • Patch delivery SLA depends on severity and branch support policy (document per-release).
• Approval rules:
  • Security-sensitive: Security sign-off required before release.
  • Emergency fast-track: Engineering lead + Release Manager sign-off; post-facto audit required.

Detailed module descriptions

Intake Module

• Purpose: standardize incoming reports and collect required metadata.
• Inputs: issue report (bug, CVE, customer report, monitoring alert).
• Outputs: ticket with required fields.
• Required ticket fields (template):
  • Title, description, reproduction steps, logs, environment, Python version, package versions, traceback, test case (if available).
  • Affected versions (list), severity (enum), CVE ID (if known), initial triage owner, links to failing CI/job.
• Automation:
  • Issue templates in GitHub/GitLab.
  • Webhooks to enrich ticket (commit info, recent deploys).
  • Auto-labeling based on keywords (CVE, security, regression).

Triage Module

• Purpose: quickly determine impact, scope, and target LTS branches.
• Inputs: intake ticket.
• Outputs: triage decision (backport/ defer/ reject), risk score, SLA, assigned owner.
• Checklist:
  • Can the defect be reproduced? (yes/no)
  • Which versions are affected? (explicit list)
  • Is there a public exploit? (yes/no)
  • Is there a safe workaround? (yes/no)
  • Does fix require API change? (yes/no)
  • Estimated effort (small/medium/large)
  • Security flag set if relevant
• Artefacts: triage comment, labels, deadline.

Planning & Approval Module

• Purpose: create an actionable backport plan and obtain approvals.
• Inputs: triage decision, risk score.
• Outputs: backport plan (target branches, branch names), approvers list, estimated effort, required reviews.
• Plan elements:
  • Target LTS branches (e.g., release-lts/v1.4, release-lts/v1.3).
  • Branch naming convention: lts/vX.Y/issue-.
  • Tests required and CI gating.
  • Rollout strategy (immediate publish vs staged canary).
• Approval flows:
  • Normal: code reviewer + QA + Release Manager.
  • Security-sensitive: add Security Reviewer.
  • Emergency: Engineering lead + Release Manager for fast-track.

Development Module

• Purpose: implement minimal, safe patch for each target LTS branch.
• Inputs: backport plan, target branches.
• Outputs: patch branches, commits, PRs/MRs with required metadata.
• Conventions:
  • Branch name: lts/vX.Y/issue-.
  • Commit message: include ticket ID, short changelog line, “Backport to vX.Y”.
  • Small, focused changes only; avoid refactors or API changes.
  • Add/adjust tests to cover the bug.
• Automation:
  • Pre-commit hooks, linters, static analysis, dependency checks.
  • CI should run targeted regression suite for backport branches.

Testing & Validation Module

• Purpose: ensure patch correctness and absence of regressions.
• Inputs: PR/MR against LTS branch.
• Outputs: test reports, QA sign-off, security scan results.
• Required tests:
  • Unit tests (must pass).
  • Integration tests for affected components.
  • Regression suite that exercises prior bug scenarios.
  • Upgrade/downgrade tests if relevant.
  • Performance smoke tests for critical paths.
  • SAST/Dependency checks for security fixes.
• Gating: automated tests must pass; at least one QA engineer must sign off (exceptions allowed only with documented approval).
• Test artifacts: test logs, environment descriptions, reproducer if available.

Release Staging Module

• Purpose: produce reproducible artifacts and verify them before public release.
• Inputs: merged patches in LTS branches.
• Outputs: build artifacts (sdist/wheel/container), checksums, signatures, release candidate (RC) metadata and SBOM.
• Steps:
  • Build artifacts in clean environment (record build env).
  • Generate checksums (SHA256) and sign artifacts.
  • Produce SBOM if required.
  • Run smoke tests against built artifacts (install & run core integration tests).
  • Produce build manifest with build id, commit SHAs, builder, dependencies.
• Storage: artifacts stored in artifact registry with immutable tags.

Release & Deployment Module

• Purpose: publish artifacts to LTS channels and execute rollout.
• Inputs: RC approval.
• Outputs: published artifacts, release notes, release metadata updated.
• Channels: PyPI/internal package repo, container registry, downloadable release page, OS packages if applicable.
• Controls:
  • Staged rollout: canary → partial → full.
  • Rollback plan documented and scripts available.
  • Versioning: semantic patch bump X.Y.Z; tag vX.Y.Z-lts or vX.Y.Z (consistent with existing scheme).
• Ops activities:
  • Execute CD job for registries.
  • Monitor health metrics and error rates.
  • If critical failure, trigger rollback and notify stakeholders.
• Post-publish tasks:
  • Update package index and upgrade metadata.
  • Close release ticket with artifacts and links.

Communication & Documentation Module

• Purpose: inform stakeholders and users, provide upgrade guidance.
• Inputs: release artifacts, changelog entries, security advisories.
• Outputs: release notes, security bulletin, internal summary, docs updates.
• Templates:
  • Short release note: 1–2 line summary, affected versions, upgrade command, link to full changelog.
  • Security advisory: severity, CVE (if assigned), impact, mitigation steps, affected versions, upgrade instructions, contact.
  • Internal status: release time, success/failure, known issues, rollback status.
• Channels: docs site, release notes page, mailing lists, status page, product communication channels.
• Timing:
  • For security releases: coordinate embargo handling with Security Reviewer before public announcement if necessary.

Post-release & Metrics Module

• Purpose: verify release success and collect telemetry for continuous improvement.
• Inputs: deployment telemetry, error reports, user feedback.
• Outputs: verification report, metrics dashboard, postmortem (if incident).
• Key metrics:
  • Time-to-triage, time-to-release, time-to-rollback.
  • Test pass rate, rollback rate, number of affected users.
  • Adoption rate of LTS release (pinned versions).
• Audit:
  • Log all state transitions with actor/timestamp.
  • Keep immutable build manifests and signatures stored with the ticket.
  • Retain release logs for retention policy period.

Branching, versioning & tagging rules

• Main/trunk used for active development.
• LTS branches: release-lts/vX.Y — only accept patch commits.
• Patch branch convention: lts/vX.Y/issue-.
• Merge flow:
  • Create PR to LTS branch. After CI & QA sign-off, merge.
  • Optionally back-merge to main if applicable; prefer cherry-pick with careful review.
• Tags: vX.Y.Z or vX.Y.Z-lts (choose one consistent scheme across project).
• Release artifacts must include commit SHAs for reproducibility.

CI/CD & testing requirements

• CI gates:
  • Lint and static analysis.
  • Unit tests.
  • Integration tests where applicable.
  • Backport-specific regression suite.
  • Security scans (SAST / dependency checks).
  • Artifact build and signing step in staging pipeline.
• Pipelines:
  • Parameterized jobs for target LTS branches.
  • Staged pipelines: build → test → smoke → sign → publish.
  • Canary/rollout pipeline with automated health checks.
• Test data:
  • Use reproducible fixture datasets.
  • Provide small reproducible unit/integration tests to ensure fixes don’t regress.

Release & rollback procedures

• Pre-release checklist:
  • All required approvals present and recorded.
  • CI green; smoke tests passed on artifacts.
  • Signatures and checksums produced.
  • Rollback procedure and previous artifact verified in registry.
  • Communications draft ready.
• Rollback steps (example for package-based release):
  1. Stop staged rollout.
  2. Mark new release as deprecated in registry.
  3. Re-publish previous artifact to staging channel or direct users to pinned version.
  4. Run remediation scripts (DB migrations reversal only if safe).
  5. Notify stakeholders and open incident ticket.
• Emergency fast-track:
  • Skip non-essential steps (e.g., extended manual QA) only when approved by Engineering lead + Release Manager.
  • Require post-facto audit, root-cause, and retrospective.

Communication templates

Release Note (short)

• Summary: Fix for [short description].
• Affected versions: vX.Y.Z -> vX.Y.Z+1
• Upgrade: pip install –upgrade your-package==vX.Y.Z+1
• Changelog: link to full changelog.

Security Advisory (template)

• CVE: CVE-XXXX-YYYY (if assigned)
• Severity: Critical/High/Medium/Low
• Affected versions: list
• Impact: brief impact summary
• Mitigation: upgrade instructions or workaround
• Contact: security@your-org.example
• Disclosure timeline: (if coordinated disclosure)

Internal Status

• Release ID, time, artifacts published, rollout status, known issues, rollback executed/needed, owner contacts.

Ticket & data model (fields)

• Ticket ID
• Title & description
• Reporter & contact
• Affected versions (list)
• Severity (enum)
• CVE ID (if applicable)
• Repro steps + test case
• Proposed patch branch names
• Target LTS branches
• Triage owner & date
• Estimated effort
• Approvals (list with timestamps and roles)
• Release versions & artifact IDs
• Build manifest link
• Post-release notes & metrics

Observability & auditing

• Record all ticket state transitions, approvals, and actions (actor + timestamp).
• Store immutable build manifests and artifact signatures with ticket.
• Monitor runtime metrics and alerts for 48–72 hours post-release (adjust per SLA).
• Keep dashboards for key metrics and export weekly reports for LTS releases.

Automation recommendations

• Auto-create tickets from monitoring alerts and CVE feeds.
• Auto-enrich tickets with commit, deploy, and environment metadata.
• Auto-generate changelog entries from commit messages following templates.
• Parameterize release pipelines for targeted LTS branches.
• Automate artifact signing and SBOM generation.
• Provide bot-driven reminders for pending approvals and approaching SLAs.

Runbooks (concise, actionable)

Triage runbook (steps)

1. Reproduce issue locally or in staging within 4h (critical) or 24h (high).
2. Identify all affected versions; label ticket accordingly.
3. Determine backport feasibility (does fix require API change?). If API-breaking, mark as deferred unless emergency.
4. Estimate effort and set SLA deadline in ticket.
5. Assign owner and required approvers. Add security flag if needed.

Backport development runbook

1. Create branch lts/vX.Y/issue-.
2. Implement minimal change; include tests.
3. Run pre-commit hooks and local CI subset.
4. Open PR to LTS branch with commit message including ticket id and changelog line.
5. Request code review and QA.

Release runbook (pre-publish)

1. Ensure PRs merged into release-lts branch.
2. Trigger staging build pipeline; produce artifacts and signatures.
3. Run smoke tests on artifacts; review build manifest.
4. Obtain Release Manager approval.
5. Publish to staging channel; start canary rollout (if applicable).
6. If canary healthy for configured window, publish to full LTS channel.
7. Update ticket and communicate.

Rollback runbook

1. Detect failure via monitoring or alerts.
2. Notify Release Manager and SRE; pause rollout.
3. Revert to previous artifact using documented scripts.
4. Re-run smoke tests and monitor.
5. If successful, document incident and trigger postmortem.

Postmortem runbook

1. Gather timeline from ticket and logs.
2. Identify root cause and contributing factors.
3. Document corrective actions (tests, process changes, automation).
4. Assign owners and deadlines for follow-up.
5. Share internally and update runbooks.

Example minimal workflow (concrete)

1. Issue opened → Intake Module enriches and assigns.
2. Triage Engineer marks severity = high → selects release-lts/v1.4 and v1.3 as targets.
3. Developer creates lts/v1.4/issue-123, adds tests, opens PR.
4. CI runs regression suite; QA signs off.
5. Release Manager stages build, signs artifacts, runs smoke tests.
6. Publish to LTS channel; Communications sends release note.
7. Monitor for 48 hours; no issues → close ticket, update metrics.

Implementation checklist

• Create issue templates and ticket fields in tracker.
• Publish triage checklist and severity rubric.
• Enforce branching policy and naming conventions.
• Add CI jobs for backport/branch-specific tests.
• Automate artifact builds, signing, and SBOM generation.
• Implement staged rollout and rollback scripts.
• Create communication templates and documentation pages.
• Instrument metrics and dashboards for LTS releases.
• Schedule periodic drills for emergency releases/rollbacks.

Glossary & FAQ

• LTS branch: release branch receiving only patch fixes.
• Backport: applying a fix from main to an older release branch.
• RC: release candidate.
• SBOM: software bill of materials.
• Canary: staged rollout to a subset of users.

FAQ (short)

• Q: When is a fix eligible for LTS? A: Security fixes and low-risk bug fixes that don’t break APIs; product policy may refine exceptions.
• Q: Who approves emergency fast-track? A: Engineering lead + Release Manager (plus Security for security-sensitive).
• Q: How are patches tagged? A: Use consistent semantic patch tags (vX.Y.Z or vX.Y.Z-lts).