Add changelog

[michalhosna]

Fixes #776
Relates #515

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This change is 

Summary by CodeRabbit

• Behavior Changes
  • Support for draft-14 has been removed; startup now fails if moqt_versions includes version 14.
  • Draft-18 SUBSCRIBE rendezvous now has a timeout, and picoquic uses its I/O thread.
• Documentation
  • Added guidance for recording user-visible changes in the changelog and preparing release entries.
• Release Notes
  • Releases now include the matching changelog section; non-prerelease releases require one.
  • Added project release history and an Unreleased section to the changelog.

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📚 Code guidelines (2)

docs/release.md — configured
docs/perf-tracking.md — configured

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Reviewing files that changed from the base of the PR and between 0867b10 and 0fe420d.

📒 Files selected for processing (2)

• .coderabbit.yaml
• .github/workflows/version-release.yml

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📝 Walkthrough

Walkthrough

The pull request adds a populated changelog and contribution guidance, scripts to extract changelog sections and compare dependency pins, and release workflow support that validates changelog sections and includes them in release notes.

Changes

Changelog and release process

Layer / File(s)	Summary
Changelog content and contribution rules CHANGELOG.md, CONTRIBUTING.md, .coderabbit.yaml	Adds Unreleased entries and release history. Contribution and review guidance describes changelog entry format, placement, and review rules.
Changelog helper scripts scripts/dev/changelog-section.sh, scripts/dev/changelog-deps.sh	Adds scripts to extract a release section and compare dependency pins with a previous tag.
Release validation and notes .github/workflows/version-release.yml, docs/release.md, docs/ci-architecture.md	The workflow validates the snapshot changelog section and uses it in release notes. The documentation describes changelog preparation and release behavior.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Other

Sequence Diagram(s)

sequenceDiagram
  participant ReleaseWorkflow
  participant SnapshotCHANGELOG
  participant ReleaseCreation
  ReleaseWorkflow->>SnapshotCHANGELOG: Read and extract the requested version section
  SnapshotCHANGELOG-->>ReleaseWorkflow: Return changelog section
  ReleaseWorkflow->>ReleaseCreation: Pass validated changelog for release notes

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Merge Risk: ⚪ Minimal · up to 0fe42

The changelog check now ties entries to the change, and release validation uses the documented changelog format. No identified issue remains that should delay merging.

Architecture Summary

Architecture risk: 🔵 Low · up to 0fe42

The change affects 4 systems.

Changed systems: docs, scripts, CHANGELOG.md, CONTRIBUTING.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — docs (service) was modified; 2 changed files map to changed impact.
• observed — scripts (service) was modified; 2 changed files map to changed impact.
• observed — CHANGELOG.md (service) was modified; 1 changed file maps to changed impact.
• observed — CONTRIBUTING.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in CHANGELOG.md: Adds the changelog introduction and Unreleased entries: draft-14 configurations now fail at startup when moqt_versions contains 14; other entries record a draft-18 timeout, picoquic I/O-thread use, and fixes for cache eviction, subscriptions, relaying, FETCH, crashes, shutdown logging, and session cleanup.
• observed — Modified behavior in CHANGELOG.md: Adds release notes for 0.3.5 and 0.3.4, covering the moxygen dependency versions, per-track QoS metrics, streamed /state, FETCH range validation, and listed fixes involving multithreading, cached FETCH responses, datagrams, namespace handling, and empty namespaces.
• observed — Modified behavior in CHANGELOG.md: Adds release notes for 0.3.1 and 0.3.0, including the release-container version fix and entries for relay hops, per-track counters, anonymous auth claims, admin endpoints, metrics, authorization parameters, PUBLISH counter naming, local-forwarder fixes, and moxygen v0.3.0.
• observed — Modified behavior in CHANGELOG.md: Adds 0.2.1 release notes, including the note that no 0.2.0 release exists; records multithreading, draft-18 SUBSCRIBE_TRACKS, listeners, authorization, configuration and observability features, image and cache behavior, draft-version defaults and forwarding requirements, and listed fixes and dependencies.

🚥 Pre-merge checks | ✅ 5 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (2 skipped: 2 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the primary change: adding project changelog support, including related entry conventions and release workflow updates.
Linked Issues check	✅ Passed	Issue #776 requests a changelog file. The PR adds CHANGELOG.md with an [Unreleased] section and release history. It adds entry conventions in CONTRIBUTING.md and integrates changelog sections in…
Out of Scope Changes check	✅ Passed	The changed files support issue #776. The documentation defines changelog and release procedures. The scripts generate dependency and release sections. The CI workflow consumes the changelog. No unrel…
Changelog Entry	✅ Passed	PASS: The reviewed range changes changelog and release-maintenance documentation, release-note automation, developer scripts, and review configuration. It does not change the shipped relay behavior, c…

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 2 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @.coderabbit.yaml:
- Line 30: Update the Unreleased-section check so it requires an added
CHANGELOG.md entry that documents the PR’s user-visible change, rather than
passing for any added line. Preserve the check’s focus on the [Unreleased]
section.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: openmoq/moqx/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: 076b52e8-b097-4803-a868-5b5906a047e5

📥 Commits

Reviewing files that changed from the base of the PR and between e49af0a and 0867b10.

📒 Files selected for processing (8)

• .coderabbit.yaml
• .github/workflows/version-release.yml
• CHANGELOG.md
• CONTRIBUTING.md
• docs/ci-architecture.md
• docs/release.md
• scripts/dev/changelog-deps.sh
• scripts/dev/changelog-section.sh

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review.

[afrind]

@michalhosna are you happy with the changelog? I wonder if it's too verbose or it reads too much like git log --oneline.

[michalhosna]

I was originally thinking about having only the "headline" part. But working through it, I came to the conclusion that almost all, if not all, user visible changes should be there. Changelog is the communication channel with the users/operators of the relay. I would assume it's the only thing that those users will read. It is often the first place to read when one deals with a bug.

I would still try to push the "headline" part as the main thing people should read. I do recognize verbosity is a problem, but I would hope I am striking some sort of balance.

it reads too much like git log --oneline.

I don't think our git disciple is there for this to work. I would love there to be. For any git commit discipline we would, must enforce clean reviewable history in the PRs. Which I am supporting, but I am in the minority here. And GitHub tooling is really not helping. Squash merges make it literally impossible to review the commit message before it hits the master, oh how much I hate GitHub for that.

Compare:

❯ git log --oneline v0.3.1..v0.3.4 | grep -v "openmoq/sync-moxygen" | grep -v "sync: update moxygen"
40482d63 fix: accept empty namespaces on draft-18+ for PUBLISH/SUBSCRIBE/FETCH/TRACK_STATUS (#687)
b092c7ff fix: prefer exact-track upstream over namespace publisher for FETCH (#685)
505472bd fix: route SUBSCRIBE/FETCH past publisher-less namespace nodes (#684)
1c2ac8da cache: convert remaining glog CHECK to folly XCHECK
ea080cfd cache: forward the datagram lastInGroup flag to the downstream consumer
d567b095 cache: record the upstream end of track
ead7710b cache: fix FETCH_OK End Location for cache-answered fetches
5d066da6 relay: hop peer subscription calls to the forwarder's executor (#683)
fb1efcbd relay: stop releasing an ending session on the relay executor (#677)
fee28b0a ci: prune superseded build caches, and report ccache statistics (#658)
76348e96 test: replace the bash relay integration tests with a Python topology harness
2bd4bb8a relay: defer CrossExecFilter destruction to its target executor
eeccc33b relay: release FetchCrossExecFilter's downstream on its target executor
9e6772e5 ci: skip conformance fetch checks
10a7c2de cache: port upstream's fetch range validation into MoqxCache
f08a792e build: root XLOG categories and debug paths past ccache
c4e664a8 build: lint and format the repo's Python with ruff
6e79e4c1 devops: fetch origin before sync-moxygen's containment check
3ac776cc dashboard: per-track QoS wiring and panel iteration (#640)
608ed30c Cache only from hosted runners; bound and harden ccache (#636)
bffca928 admin: stream /state as the walk produces it
b720bcff relay: walk /state on the executor that owns each service
c8f5d6e9 relay: count ingest on the relay executor, drop bogus subscriber counts
ff2454cb relay: walk cached track stats in place
10870861 per-track metrics: scrape stack, relay-visible dashboard, public variant (#539)

Vs

[0.3.4] - 2026-09-05

• Per-track QoS metrics and dashboards. (#539, #640)
• /state is streamed and reports correct per-track counts. (#627, #630, #632, #633)

Changed

• FETCH validates its requested range. (#662)

Fixed

• Crashes in multi-threaded mode. (#653, #654, #677, #683)
• FETCH served from the cache reported the wrong End Location. (#678, #679)
• The datagram lastInGroup flag was dropped. (#681)
• SUBSCRIBE and FETCH failed past namespace nodes with no publisher. (#684)
• FETCH preferred a namespace publisher over an exact-track upstream. (#685)
• Draft-18 rejected empty namespaces. (#687)

Dependencies

• moxygen v0.3.4

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