Migrate OpenTelemetry smoke test to JUnit

[PerfectSlayer]

What Does This Do

This PR migrates the OpenTelemetry smoke tests to the new JUnit smoke test framework.

Motivation

The new tests checks the whole trace structures and span values, in addition to trace payload validity and invariants.

Additional Notes

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: APMLP-1247

[datadog-datadog-prod-us1-2]

More details

The JUnit migration preserves the OpenTelemetry smoke application launch and validates its one annotated trace plus ten sequential manual traces with the new backend assertions. No diff-only behavioral regression was confirmed; no additional tests recommended because the existing application shape is deterministic and the attempted module execution was blocked by unavailable Gradle/JDK tooling.

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[chatgpt-codex-connector]

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[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.97 s	13.88 s	[-0.0%; +1.3%] (no difference)
startup:insecure-bank:tracing:Agent	12.89 s	12.98 s	[-1.4%; +0.1%] (no difference)
startup:petclinic:appsec:Agent	17.46 s	16.51 s	[+1.3%; +10.1%] (significantly worse)
startup:petclinic:iast:Agent	17.29 s	17.45 s	[-1.6%; -0.2%] (maybe better)
startup:petclinic:profiling:Agent	17.48 s	17.36 s	[-0.6%; +1.9%] (no difference)
startup:petclinic:sca:Agent	17.22 s	17.04 s	[+0.1%; +2.0%] (maybe worse)
startup:petclinic:tracing:Agent	16.46 s	16.61 s	[-1.8%; -0.0%] (maybe better)

Commit: 36e7755f · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.

[datadog-datadog-prod-us1-2]

Bits has a CI fix ready

🟢 Investigated · 🟢 Fix prepared · ⚪ Validation skipped · 🟠 Ready

OpenTelemetrySmokeTest assumed trace delivery order when validating the annotated and manual OpenTelemetry spans. It now uses UNORDERED matching so the test validates all expected traces without depending on their arrival order.

Commit fix to this PR

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View in Datadog | Reviewed commit 36e7755 · Any feedback? Reach out in #deveng-pr-agent