feat: add app-level indy A/B benches to the performance workflow

[jamesfredley]

Purpose

Teach CI to measure app-level indy vs classic callsite, not just JMH micros.

This does not change the Grails plugin indy default. That remains #16165.

What landed

• AppHttpBench helper + unit tests (rejects empty sample sets, clamps fork count)
• Gated AppBench* specs for latency, app1, and gsp-layout
• gsp-layout now depends on grails-testing-support-http-client
• Native Gradle orchestrator: ./gradlew :grails-benchmarks:appIndyBench
• benchmark.yml app-bench job on the performance label calls that single task (warmup 80 / samples 300 / forks 2)
• No PowerShell, shell, or Python runner

Local usage

./gradlew :grails-benchmarks:appIndyBench

Optional: -PappBenchWarmup, -PappBenchSamples, -PappBenchForks, -PappBenchOutDir.

Local numbers already posted on #16165

Same harness, same settings: latency 0.98x, app1 0.99x, no clear change. gsp-layout was skipped there because that module lacked the HTTP client dep; this PR adds it.

Test plan

• AppHttpBenchSpec
• AppIndyBenchSpec
• CI performance label runs the new job

[Copilot]

Pull request overview

This PR extends the performance-labeled CI workflow to run app-level HTTP benchmarks comparing Groovy indy vs classic callsite dispatch, emitting JMH-compatible JSON so results can be compared with the existing :grails-benchmarks:jmhCompare tooling.

Changes:

• Add AppHttpBench helper (and unit tests) to measure HTTP request latency and write JMH-shaped JSON output.
• Add gated AppBench* integration specs in grails-test-examples (latency, app1, gsp-layout) and wire a shared Gradle test configuration to pass bench properties.
• Add a new app-bench GitHub Actions job (runs noindy then indy, then publishes a comparison report and artifacts) and a local PowerShell runner.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
grails-testing-support-http-client/src/main/groovy/org/apache/grails/testing/http/client/bench/AppHttpBench.groovy	New helper to measure request timings and emit JMH-compatible JSON entries.
grails-testing-support-http-client/src/test/groovy/org/apache/grails/testing/http/client/bench/AppHttpBenchSpec.groovy	Unit tests for the new bench helper behavior.
grails-test-examples/latency/src/integration-test/groovy/latencyapp/AppBenchFastPingSpec.groovy	New gated integration bench for a simple controller render path.
grails-test-examples/latency/build.gradle	Applies shared app-bench Gradle wiring to pass bench properties to tests.
grails-test-examples/app1/src/integration-test/groovy/functionaltests/AppBenchInterceptorDemoSpec.groovy	New gated integration bench for interceptor + controller path.
grails-test-examples/app1/build.gradle	Applies shared app-bench Gradle wiring to pass bench properties to tests.
grails-test-examples/gsp-layout/src/integration-test/groovy/org/example/grails/layout/AppBenchDemoRenderTextSpec.groovy	New gated integration bench for GSP layout app request path.
grails-test-examples/gsp-layout/build.gradle	Adds HTTP client support dependency for integration tests + applies app-bench wiring.
gradle/app-bench-config.gradle	New shared Gradle config to set system properties and disable caching when benches are enabled.
grails-benchmarks/scripts/run-app-indy-bench.ps1	Local runner to execute noindy/indy benches and compare results.
.github/workflows/benchmark.yml	Adds app-bench job gated by the performance label and publishes comparison artifacts/summary.

Suppressed comments (2)

grails-benchmarks/scripts/run-app-indy-bench.ps1:96

• This script is invoked via pwsh (cross-platform), but it calls gradlew.bat, which will fail on non-Windows systems. Use gradlew on Unix-like systems.

    & "$root\gradlew.bat" '-q' ':grails-benchmarks:jmhCompare' `

grails-benchmarks/scripts/run-app-indy-bench.ps1:115

• This script is invoked via pwsh (cross-platform), but it calls gradlew.bat, which will fail on non-Windows systems. Use gradlew on Unix-like systems.

& "$root\gradlew.bat" '-q' ':grails-benchmarks:jmhCompare' `

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[codecov]

Codecov Report

❌ Patch coverage is 74.07407% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.1404%. Comparing base (cd062bf) to head (b8561d4).

Files with missing lines	Patch %	Lines
...ails/testing/http/client/bench/AppHttpBench.groovy	74.0741%	20 Missing and 8 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##                9.0.x     #16169        +/-   ##
==================================================
+ Coverage     53.1116%   53.1404%   +0.0289%     
- Complexity      19362      19393        +31     
==================================================
  Files            2081       2082         +1     
  Lines           99018      99126       +108     
  Branches        17375      17389        +14     
==================================================
+ Hits            52590      52676        +86     
- Misses          38867      38881        +14     
- Partials         7561       7569         +8     

Files with missing lines	Coverage Δ
...ails/testing/http/client/bench/AppHttpBench.groovy	74.0741% <74.0741%> (ø)

... and 3 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: b8561d4
▶️ Tests: 72291 executed
⚪️ Checks: 81/81 completed

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