Run 2 of 4 Gradle hosted Windows cells on PRs

[Mikola Lysenko (mikolalysenko)]

Fixes #1300

Problem

Every PR that matches gradle-compatibility.yml's paths: (~60–100 full runs/day) runs the 43-test hosted Gradle suite on Windows four times, once per Gradle line. Baseline run 37960054571 (2026-10-09 16:34):

cell (windows-latest)	job min
8.14.3 / jdk 21 / hosted	42.3
9.8.0 / jdk 21 / hosted	33.3
7.6.6 / jdk 17 / hosted	28.1
6.9.4 / jdk 11 / hosted	28.0
4 vendor cells	36.6
4 agent cells	16.4
build	4.1
total	~189 Windows job-min, wall clock ~47 min

The 4 hosted cells are 132 of the ~189 Windows job-min (70%), and the 8.14.3 cell sets the wall clock. None failed on a PR in the windows sampled by #1300 / #1177 / #1255.

Change

Two exclude entries in cells, keyed on the event like the existing macOS/ubuntu ones: on pull_request only, skip windows-latest × {7.6.6, 8.14.3} × hosted. On schedule / workflow_dispatch the os value is '', which matches no cell, so the nightly grid is still the full 36 cells. Header comment updated.

Expected saving

• ~70 Windows job-min per full PR run (28.1 + 42.3 in the baseline; 41 + 42 in CI perf: Gradle compatibility — 4 Windows hosted cells (36–42 min each) on every matching PR are 70% of the run (~5,000 Windows job-min/day) #1300's sample) → ~4,000–8,000 Windows job-min/day.
• PR wall clock of this (non-required) workflow drops from ~47 to ~38 min, bound by the 9.8.0 hosted cell.
• No effect on ci-ok, clippy or the merge queue: this workflow doesn't run in merge_group.

Measured result

This PR's run 37970547476 (head 3edc241, success) vs baseline 37960054571:

Windows jobs	baseline (job-min)	this PR (job-min)
hosted 6.9.4	28.0	21.8
hosted 7.6.6	28.1	not run
hosted 8.14.3	42.3	not run
hosted 9.8.0	33.3	33.5
4 vendor cells	36.6	39.5
4 agent cells	16.4	18.3
build	4.1	4.1
total Windows	188.8	117.2 (−71.6, −38%)

• Critical path to the last Windows cell: build + slowest hosted cell went from 4.1 + 42.3 ≈ 46 min to 4.1 + 33.5 ≈ 38 min.
• The two excluded cells don't appear in the run at all, so the exclude matches as intended. This run also ran the ubuntu extras (the PR touches the workflow file, so gradle_core=true). Those aren't in the baseline and don't change the Windows comparison.
• macOS: 0 before and 0 after. Merge queue: not affected (this workflow has no merge_group trigger).

Where each moved test still runs

• Hosted suite on Windows, Gradle 7.6.6 and 8.14.3: nightly (17 4 * * *) and workflow_dispatch of gradle-compatibility.yml.
• Hosted suite on all 4 lines: ubuntu, ci.yml e2e on every PR and in the merge queue (unchanged).
• Hosted on Windows on 6.9.4 and 9.8.0, plus all 4 agent and 4 vendor Windows cells: still every matching PR.

Risk

A regression that hits only Windows and only hosted mode on the middle two Gradle lines would surface in the next nightly instead of on the PR. No test, assertion or required check changes. Local checks: scripts/tests/test_ci_e2e_tiers.py + test_ci_gradle_prefixes.py pass (33 tests); zizmor and actionlint report the same findings as on main (pre-existing).

🤖 Generated with Claude Code

https://claude.ai/code/session_01VrgiQoDwt3vjxG2zNfZBAA

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[Mikola Lysenko (mikolalysenko)]

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^{Reviewed by Cursor Bugbot for commit 2418944. Configure here.}

[Mikola Lysenko (mikolalysenko)]

hosted-e2e failed on 2418944: production now serves minimist@1.2.2 patch 642d7f02 while the live suites pin 80630680 (#1293), so 8 hosted install proofs fail on every head. Not this PR's change. Ported #1301's repin verbatim in bc3d7f6 (no-op once #1301 lands).

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[Mikola Lysenko (mikolalysenko)]

Ready for review at 3edc2411dd39.

• CI: required checks ci-ok and clippy green; 8 check suites succeeded.
• Mergeable against main, no CHANGELOG.md change.
• Bugbot reviewed this head; no unresolved review threads.

Labeled Ready for review by the burn-down agent. Slack announcement pending (connector unavailable this run).

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[Mikola Lysenko (mikolalysenko)]

Taken out of the merge queue: it conflicts with #1362 (Depot runners, at the head of the queue), and its change (Windows Gradle hosted PR coverage on 6.9.4 + 9.8.0 only) is included in #1355, which also Fixes #1300. If #1355 lands, this can be closed as superseded.

[Mikola Lysenko (mikolalysenko)]

Folded into #1375 at the maintainer's request (#1362 already merged). #1375 carries this change (2 of 4 Gradle hosted Windows cells on PRs) unchanged, re-applying the Depot runner mapping from #1362. Closing in favour of #1375.