Metrics Rs Metrics Metrics

Workspace Release

Coordinated patch/minor releases of the workspace crates: metrics, metrics-util, metrics-exporter-prometheus, metrics-exporter-dogstatsd, metrics-exporter-tcp, metrics-observer, metrics-tracing-context, metrics-benchmark.

cargo-release is configured (workspace release.toml and metrics/release.toml) to do the [Unreleased] -> [version] - date substitution and tag/push at release time. Tags follow the pattern <crate-name>-v<version>.

Workflow at a glance

1. Audit — find unreleased changes per crate
2. Plan — version bumps, draft changelog entries, schedule PR notifications
3. Confirm the plan with the user before any destructive action
4. Iterate per crate in dependency order (one crate fully done — release + notifications + label removal — before starting the next; pause for explicit user confirmation between crates and before each cargo-release --execute)
5. Sanity check — S-awaiting-release queue should be empty

Phase 1 — Audit

Two complementary signals; the git logs are authoritative because the label is applied by hand and may be missing.

# Per-crate unreleased commits (authoritative)
git log --oneline <crate>-v<current_version>..HEAD -- <crate>/

# PRs explicitly flagged awaiting release (informative — may have gaps)
gh pr list --state merged --label "S-awaiting-release" --limit 100 \
  --json number,title,labels,mergedAt,url

Current versions live in each crate's Cargo.toml. There's also a helper:

./scripts/show-release-candidates.sh

For each commit, run git show --stat <sha> to see which crates' source files it touched (a single PR may touch many crates — record every crate it touches, because each gets its own changelog entry referencing the PR).

Skip these from the audit:

• Pure chore(deps): bump X from A to B dependabot commits — they ride along in the release without dedicated changelog entries unless they have user- facing impact (e.g., MSRV bump).
• <!-- next-header -->-only changes from prior cargo-release runs.

Phase 2 — Plan

Version bump assessment

For 0.x crates, semver treats minor as breaking:

• Patch (0.x.y → 0.x.(y+1)): all changes are additive (new methods, new trait impls, #[deprecated] annotations, const fn qualifications, internal restructuring with private fields, performance changes, bug fixes).
• Minor (0.x.y → 0.(x+1).0): any change that breaks downstream compilation — removed/renamed public items, changed signatures, changed trait bounds, MSRV bumps the public API depends on.

Default to patch unless evidence of breakage exists. Verify by looking at public API diffs (pub items, trait signatures) — internal changes (struct field types, hash algorithms) are not breaking even if behavior shifts.

Inter-crate dependency cascade

Workspace deps are declared as ^0.24 (metrics) / ^0.20 (metrics-util) etc. Caret on 0.x = >=0.x.0, <0.(x+1).0. So patch bumps don't cascade — dependents pick up the new patch automatically. Minor bumps do cascade — every dependent must update its dep declaration and re-release.

Dependency order for releases:

1. metrics — no workspace deps
2. metrics-util — depends on metrics
3. Exporters / tools (any order): metrics-exporter-prometheus, metrics-exporter-dogstatsd, metrics-exporter-tcp, metrics-observer, metrics-tracing-context
4. metrics-benchmark (publish=false) — optional housekeeping bump

Changelog entries

Each released crate gets entries under ## [Unreleased] - ReleaseDate in its CHANGELOG.md. Use Keep-a-Changelog sub-headings: ### Added, ### Changed, ### Fixed, ### Deprecated, ### Removed. Each bullet ends with the PR link: ([#NNN](https://github.com/metrics-rs/metrics/pull/NNN)).

Keep the literal ## [Unreleased] - ReleaseDate header in place; cargo-release substitutes it at release time per the pre-release-replacements in the release.toml files.

When to skip a crate

• metrics-tracing-context: skip if the only changes are Cargo.toml metadata (toolchain/MSRV inheritance, etc.). It has no functional changes worth a release. Note: it tends to accumulate stale duplicated Unreleased entries (e.g., "Update metrics-util to 0.20" repeated from a prior release) — clean those up the next time it gets a real release.
• metrics-benchmark: skip unless explicitly asked. publish = false and no CHANGELOG.md exists, so cargo-release fails on the pre-release-replacements. Manual Cargo.toml bump + tag is possible but rarely useful.
• metrics-observer: tends to also have stale duplicated Unreleased entries to clean up. Replace the stale block when adding new entries.

PR comment scheduling

Each PR receives exactly one consolidated comment, posted during the iteration that releases the last crate (in dependency order) that the PR touched. Multi-crate PRs are deferred until that final crate ships, so the comment can list every crate the work went out in. The S-awaiting-release label (where present) is removed in the same step.

For each PR, build a "touched crates" list from git show --stat <sha>. The last one in the release order above is the iteration where it gets notified.

Comment template

Single crate:

Released as `<crate>@v<ver>`.

Thanks for your contribution! :heart:

Multi-crate (Oxford-comma):

Released as `<crate-1>@v<ver>`, `<crate-2>@v<ver>`, and `<crate-3>@v<ver>`.

Thanks for your contribution! :heart:

Special cases

• Maintainer's own PRs: skip the comment ("Thanks for your contribution!" on your own PR is awkward), but still remove the label.
• PRs without S-awaiting-release: still post a comment if their work shipped (it's fine to thank a contributor whose label was missing); just no label to remove.
• Pure metadata/toolchain PRs (no user-facing crate impact, e.g., a rust-toolchain.toml removal that only edits Cargo.toml fields): comment is optional — the change has no specific crate to point at. Skip-by-default unless the user disagrees.

Phase 3 — Confirm with the user

Write the plan into a plan file (or surface it inline if no plan-mode file is provided), structured per this skill's example output:

• Per-crate: current → proposed version, list of PRs by category (Added / Changed / Fixed / Deprecated / Removed), draft changelog entries
• Release order
• PR comment schedule (which PR gets notified at which step)

Wait for explicit user approval before any commits or cargo release --execute.

Phase 4 — Execute (per-crate iteration)

For each crate in dependency order:

a. Edit the crate's CHANGELOG.md

Insert the drafted bullets under ## [Unreleased] - ReleaseDate. Keep the literal Unreleased heading. If the crate has stale duplicated Unreleased content (typical for metrics-observer and metrics-tracing-context), clean that up too.

b. Commit the changelog edit

cargo-release requires a clean working tree. Commit changelog edits in a dedicated commit before invoking cargo release:

git add <crate>/CHANGELOG.md
git commit -m "update CHANGELOG for <crate>"

GPG signing: this repo enforces signed commits. If the GPG agent isn't unlocked, the commit fails with gpg: signing failed: No such file or directory (pinentry can't reach a TTY from the agent context). Ask the user to unlock GPG (echo test | gpg --clearsign > /dev/null from a TTY caches the passphrase), then retry. Do not bypass with --no-gpg-sign unless the user explicitly authorizes it.

c. Dry-run cargo-release

cargo release -p <crate> patch

(No --execute flag = dry-run.) Inspect the output — confirm:

• Version bump is right (Upgrading <crate> from X.Y.Z to X.Y.(Z+1))
• CHANGELOG substitution looks correct (your bullets land under [X.Y.(Z+1)], fresh empty [Unreleased] added on top)
• Push target is <crate>-v<new-version>

d. Pause for user confirmation before --execute

Crates.io publishes are permanent (you can yank but not delete). Even with auto mode active, this is a destructive/external action and needs explicit user authorization. Show the dry-run summary and wait for "go ahead".

e. Execute the release

cargo release -p <crate> patch --execute --no-confirm

This: bumps Cargo.toml, stamps CHANGELOG.md/RELEASES.md, creates a signed chore: Release commit + signed <crate>-v<version> tag, publishes to crates.io, pushes main + tag to origin.

f. PR notifications for this iteration

Run the comments + label removals for every PR whose final touched crate is this one (per the schedule from Phase 2).

# Comment
gh pr comment <NUMBER> --body "$(cat <<'EOF'
Released as `<crate>@v<ver>`.

Thanks for your contribution! :heart:
EOF
)"

# Label removal — DO NOT use `gh pr edit --remove-label`. It currently fails
# with a GraphQL error about Projects (classic) deprecation:
#   GraphQL: Projects (classic) is being deprecated...
# Use the REST API instead:
gh api -X DELETE /repos/metrics-rs/metrics/issues/<NUMBER>/labels/S-awaiting-release

Comments and label removals on different PRs are independent — run them in parallel within a single message of tool calls.

g. Pause before the next crate

Mark this crate's todo complete. Surface a summary (released version, PR comments posted, labels removed). Wait for explicit user "go" before starting the next crate.

Phase 5 — Sanity check

After the last crate:

gh pr list --state merged --label "S-awaiting-release" --limit 100

Should be empty (modulo any PRs the user explicitly chose to skip — e.g., metadata-only PRs flagged optional in Phase 2).

Also useful:

git log --oneline -20            # see the release commits in order
git tag --list 'metrics*-v*' --sort=-creatordate | head -10

Reference: example invocation

# Phase 1 audit
./scripts/show-release-candidates.sh
git log --oneline metrics-v0.24.3..HEAD -- metrics/
gh pr list --state merged --label "S-awaiting-release" --limit 100 --json number,title,labels,url

# Phase 4 per-crate (example: metrics)
git add metrics/CHANGELOG.md && git commit -m "update CHANGELOG for metrics"
cargo release -p metrics patch                              # dry-run, pause for user
cargo release -p metrics patch --execute --no-confirm       # publishes after user "go"
gh pr comment 654 --body "Released as \`metrics@v0.24.4\`. Thanks for your contribution! :heart:!"
# (PR #654 unlabeled in this case, otherwise:)
# gh api -X DELETE /repos/metrics-rs/metrics/issues/654/labels/S-awaiting-release

Gotchas (from prior runs)

• GPG agent must be unlocked before commits. Ask the user to unlock from a TTY-capable terminal first; don't bypass with --no-gpg-sign.
• gh pr edit --remove-label is broken (Projects-classic deprecation error). Use gh api -X DELETE /repos/metrics-rs/metrics/issues/<n>/labels/S-awaiting-release.
• cargo-release skips dirty workspace members by default — the warnings about "skipping which has files changed since -v" are expected when releasing one crate at a time; ignore them.
• Don't try to release metrics-benchmark via cargo-release unless you first create a metrics-benchmark/CHANGELOG.md. The pre-release-replacements rule in the workspace release.toml requires every crate to have one. The plan should mark it optional/skip.
• Crates.io publish wait: cargo-release prints "note: waiting for v to be available at registry crates-io." This may take 30s–2m. Don't treat the wait as a hang.
• Push warning about vulnerabilities: each push to main prints "GitHub found N vulnerabilities (... high, ... low)". Unrelated to the release; mention it as a follow-up but don't block on it.
• Stale Unreleased changelog entries: metrics-observer and metrics-tracing-context tend to have leftovers from prior cycles (e.g., "Update metrics-util to 0.20" duplicated). Clean them up when editing those changelogs.

Source: metrics-rs/metrics — distributed by TomeVault.