Remove AgentTracer.noopScope() sentinel

[mcculls]

Motivation

This helps with switching between the two context manager approaches, since the checks now don't assume a particular implementation.

Additional Notes

To be merged in once #12008 is merged

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: [PROJ-IDENT]

[datadog-official]

Removing the exported AgentTracer.noopScope() method is source- and binary-incompatible for custom instrumentations compiled against the current bootstrap API: an upgraded agent can throw NoSuchMethodError when that instrumentation loads or calls the method. The replacement public NoopScope singleton requires downstream recompilation and does not preserve existing callers.

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[chatgpt-codex-connector]

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[mhlidd]

LGTM

[datadog-official]

🎯 Code Coverage (details)
• Patch Coverage: 33.33%
• Overall Coverage: 57.14% (-0.45%)

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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	14.86 s	14.55 s	[+1.4%; +2.9%] (significantly worse)
startup:insecure-bank:tracing:Agent	13.60 s	13.68 s	[-1.2%; +0.2%] (no difference)
startup:petclinic:appsec:Agent	16.91 s	16.78 s	[-0.2%; +1.7%] (no difference)
startup:petclinic:iast:Agent	16.86 s	16.95 s	[-1.4%; +0.3%] (no difference)
startup:petclinic:profiling:Agent	16.06 s	16.80 s	[-8.4%; -0.4%] (maybe better)
startup:petclinic:sca:Agent	16.90 s	16.85 s	[-0.5%; +1.1%] (no difference)
startup:petclinic:tracing:Agent	16.05 s	16.10 s	[-1.1%; +0.5%] (no difference)

Commit: f09eb71b · 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.

[dd-octo-sts]

/merge

[gh-worker-devflow-routing-ef8351]

View all feedbacks in Devflow UI.

2026-07-27 21:41:11 UTC ℹ️ Start processing command /merge

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2026-07-27 21:41:15 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 1h (p90).

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2026-07-27 23:15:18 UTC ℹ️ MergeQueue: This merge request was merged