fix(ci): run sweep and conformance shards nightly instead of on every pull request - #2244
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… pull request The 46 Sweep/Conformance shards exercise every model, so the coverage map attributes almost any model change to them and they ran on nearly every pull request and every post-merge push. Measured on #2226's real selection: 121 of 164 shards selected, all 46 of these among them. They are now marked nightlyOnly in test-shards.yml and deferred out of pull_request and push matrices. They still run every night in the coverage-everywhere run on master (workflow_dispatch, unchanged), and an escalated selection still runs the complete matrix, so a change to CI itself is unaffected. The existing empty-matrix and ledger guards run after the filter, so they still validate what remains. Measured: #2226's selection goes from 121 to 75 shards. Verified: Test-CiImpactWorkflow.ps1, Test-CiImpactWorkflowReview.ps1 (66 unsafe mutations rejected) and Test-ShardManifestDrift.ps1 pass; a new contract assertion fails when the filter is removed and restores cleanly. Part of #2243 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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WalkthroughThe change marks selected test shards as nightly-only. The validation workflow reads selector route reasons and defers eligible nightly-only shards from pull request and push matrices. Contract checks verify the filtering rules and shard count. ChangesNightly shard deferral
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Other Sequence Diagram(s)sequenceDiagram
participant CertifiedMapSelector
participant SelectShardsJob
participant TestMatrix
participant NightlyCoverageRun
CertifiedMapSelector->>SelectShardsJob: Return selected shards and route reasons
SelectShardsJob->>SelectShardsJob: Evaluate nightlyOnly and route conditions
SelectShardsJob->>TestMatrix: Keep eligible shards
SelectShardsJob->>NightlyCoverageRun: Defer filtered nightly-only shards
Suggested reviewers: Merge Risk: 🔵 Low · up to The change remains mergeable, but partial pushes may run unnecessary shards and the contract test should verify the intended shard set exactly. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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The first version dropped every nightlyOnly shard from pull request and push
matrices. Its own CI run showed why that is wrong: the selector correctly
required all 46 sweep/conformance shards because this change redefines them
("its manifest or execution policy changed"), and the filter removed exactly
those, leaving 2 shards to validate the change.
The deferral now reads the selector's per-shard routes and keeps a
nightly-only shard when:
- its manifest or execution policy changed, or
- it runs a changed test file that no still-running shard also runs. The sweep
filters are broad - #2226's new Finance test file was routed to every
Conformance window - so that route alone does not mean the change touched
the sweep. All owners are kept, because the 8 ParameterCountContractTests
shards each run a different eighth of one sweep.
Everything else (always-run, coverage attribution, map bookkeeping) defers.
Without routes - any path other than the mapped selector - nothing defers.
Measured by running the filter on the real selector routes of two runs:
#2244 (this change) 48 selected -> 48 run; #2226 121 selected -> 75 run.
Verified: Test-CiImpactWorkflow.ps1 (with new assertions for both keep rules
and the route capture), Test-CiImpactWorkflowReview.ps1 and
Test-ShardManifestDrift.ps1 pass; the edited step parses with zero errors.
Part of #2243
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
In `@tools/TestImpact/Test-CiImpactWorkflow.ps1`:
- Around line 820-822: Replace the nightlyOnlyEntries count-only assertion in
Test-CiImpactWorkflow with manifest parsing that verifies the exact 46 expected
nightly-only shard names have nightlyOnly set to true, including explicitly
confirming Sweep - ParameterEnumerationParityTests is not nightly-only. Do not
rely on the current comment-sensitive anchored regular expression; validate
shard identities and boolean values from the parsed test-shards manifest.
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.github/test-shards.yml.github/workflows/sonarcloud.ymltools/TestImpact/Test-CiImpactWorkflow.ps1
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… workflow loads The previous commit inlined the deferral in the Select step and took that run block to 22,355 characters. GitHub evaluates a run: block containing an expression as one expression capped at 21,000, so it refused the whole workflow: no pull request run was created, only a 0-job push run that "likely failed because of a workflow file issue". yq, the PowerShell parser and actionlint all accepted the file. - The logic is now Get-DeferredNightlyShards in CiWorkloadKinds.ps1, with the rationale in its help. The step calls it; the step is 19,970 characters. - Test-CiWorkloads.ps1 exercises it on six cases taken from real runs: no routes, always-run only, a sweep whose own definition changed, a test file a running shard also runs, a test file only sweeps run, and a non-nightly shard. Three mutations of the keep rules each fail their own case. - Test-CiImpactWorkflow.ps1 now fails any workflow run block with an expression at or over 21,000 characters. Pointed at the broken commit it reports "sonarcloud.yml line 779: run block is 22354 characters". - Review: the nightlyOnly contract now asserts identities, not a count. Every worker-backed inventory shard must be nightlyOnly, every other inventory shard (ParameterEnumerationParityTests, the contract surveys) must not be, and the manifest total must equal the worker-backed count. Moving the flag from ParameterCountContractTests 0/8 to ParameterEnumerationParityTests fails both per-shard checks. Verified: Test-CiWorkloads, Test-CiImpactWorkflow, Test-CiImpactWorkflowReview and Test-ShardManifestDrift pass; the Select step parses with zero errors; actionlint reports nothing. Part of #2243 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Part of #2243
Why
The 46 Sweep/Conformance shards exercise every model, so the coverage map attributes almost any model change to them. They ran on nearly every pull request and every post-merge push. On #2226's real selection, 121 of 164 shards were selected, all 46 of these among them.
Change
.github/test-shards.yml:nightlyOnly: trueon exactly the 46 worker-backed sweep/conformance shards..github/workflows/sonarcloud.yml(Select shards): onpull_requestandpush, when selection is not escalated, dropnightlyOnlyshards from the matrix. The existing empty-matrix and ledger guards run after this, so they still validate what remains.tools/TestImpact/Test-CiImpactWorkflow.ps1: contract assertion that the filter and all 46 markers stay in place.Unchanged: the nightly coverage-everywhere run (
workflow_dispatch) still runs all 164, including these 46. An escalated selection, such as a change to CI itself, still runs everything.Measured
Verified locally
Test-CiImpactWorkflow.ps1,Test-CiImpactWorkflowReview.ps1(66 unsafe mutations rejected) andTest-ShardManifestDrift.ps1all pass.if ($false)fails the new assertion; the file restores byte-identical.Trade-off
A regression that only a sweep can catch is found by the next night's run, not before merge.
🤖 Generated with Claude Code
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Chores
Tests