iotaledger / iota / 29793442693
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Files 1126
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coverage: 68.842% (+0.02%) from 68.822%
29793442693

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feat(ci): use merge queues (#12322)

# Description of change

## Motivation

Heavy CI (Rust tests + simtests, split-cluster compatibility checks)
currently runs on every non-draft PR push. Contributors pushing several
commits in a row saturate the self-hosted runner pool with runs on work
that isn't ready for that level of verification, starving other PRs and
`develop` (#11253).

Two earlier approaches gated heavy tests behind explicit opt-ins — a
"ready" label (#11263) and a PR-description checkbox (#11540) — but both
required custom dispatcher machinery (`pull_request_target` +
`workflow_dispatch`) with many edge cases: results not attached to the
PR, no way to enforce that heavy tests passed before merge, and logic
that can only be tested after merging.

GitHub's **merge queue** solves the same problem with built-in
machinery: heavy tests run **exactly once per merge, pre-merge**, on the
PR merged onto the latest `develop`, and are enforceable as a required
status check.

## How it works

- `hierarchy.yml` and `pr_lint.yml` get a `merge_group` trigger. When a
PR is queued, GitHub merges it (plus any PRs ahead of it) onto `develop`
in a temporary `gh-readonly-queue/*` branch and requests checks on that
result.
- The heavy jobs — the `rust-tests` chain in `_rust.yml` (incl. the two
paths-filter jobs that only feed it), `split-cluster`, and
`split-cluster-sync-check` — now run only on `merge_group` and on pushes
to long-lived branches, no longer on `pull_request` events.
`dorny/paths-filter` (pinned v4.0.1) supports `merge_group` natively
(diffs `base_sha..head_sha`), so crate change filtering keeps working in
the queue.
- A new plain job **`heavy-tests-status`** aggregates the heavy jobs'
results and is the single check to mark as required. It has to be a
plain `always()` job rather than requiring the nested heavy checks
directly: on `pull_request` events the heavy jobs are skipped
reusable-workflow calls, and a skipped `uses:` job never expands its
... (continued)

167431 of 243211 relevant lines covered (68.84%)

501485.95 hits per line

Coverage Regressions

Lines Coverage ∆ File
254
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91.27
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 -0.11% crates/iota-node/src/lib.rs
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 1.06% crates/iota-core/src/transaction_orchestrator.rs
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 -0.06% crates/iota-core/src/authority_aggregator.rs
60
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48
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 0.35% crates/iota-core/src/authority/consensus_quarantine.rs
19
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 -0.75% crates/iota-protocol-config/src/lib.rs
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13
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 -1.52% crates/iota-core/src/consensus_adapter.rs
12
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 -0.44% crates/starfish/core/src/authority_service.rs
10
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10
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 -3.12% crates/iota-transaction-checks/src/deny.rs
9
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 -1.26% crates/iota-json-rpc-types/src/iota_object.rs
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 -16.67% crates/iota-network-stack/src/anemo_ext.rs
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7
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7
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6
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6
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5
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4
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 -0.12% crates/starfish/core/src/dag_state.rs
4
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 1.83% crates/test-cluster/src/lib.rs
3
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 -0.75% crates/iota-config/src/genesis.rs
3
87.25
 -1.2% crates/iota-core/src/authority_server/mod.rs
3
80.61
 -0.18% crates/iota-core/src/checkpoints/mod.rs
3
77.05
 -4.92% crates/iota-core/src/traffic_controller/nodefw_test_server.rs
3
73.53
 -8.82% crates/iota-genesis-builder/src/stardust/types/output_header.rs
3
85.42
 -0.27% crates/iota-json-rpc/src/read_api.rs
3
79.02
 -0.35% crates/iota-sdk/src/wallet_context.rs
3
72.2
 -0.62% crates/iota-swarm/src/memory/swarm.rs
3
88.15
 1.67% crates/iota-test-transaction-builder/src/lib.rs
3
0.0
 -33.33% crates/typed-store/src/rocks/errors.rs
2
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 0.72% crates/iota-network/src/randomness/mod.rs
1
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 0.0% crates/iota-core/src/generate_format.rs
1
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 -4.35% crates/iota-keys/src/random_names.rs
1
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 1.18% crates/iota-network/src/state_sync/mod.rs
1
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 -0.11% crates/starfish/core/src/commit_syncer/fast.rs
Jobs
ID Job ID Ran Files Coverage
1 nextest+simtest - 29793442693.1 1126
68.84
 GitHub Action Run
Source Files on build 29793442693