chore(config): migrate spanTimeout

[mtoffl01]

What does this PR do?

Migrate tracer to use Config.spanTimeout. Also, change spanTimeout true default from 0 to 10 minutes. This was always the effective default, although only set if debugAbandonedSpans was enabled. With this change, the default is consistent, but the feature remains unused if debugAbandonedSpans is not enabled.

Motivation

https://datadoghq.atlassian.net/browse/APMAPI-1748

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• New code is free of linting errors. You can check this by running ./scripts/lint.sh locally.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

Unsure? Have a question? Request a review!

[mtoffl01]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(config): Config Visibility - report telemetry about all config sources #4247
• migrate ciVisibilityEnabled #4293
• chore(config): migrate serviceName #4292
• chore(config): migrate retryInterval #4240
• chore(config): migrate serviceMappings #4281
• chore(config): migrate featureFlags #4280
• chore(config): migrate env #4279
• chore(config): migrate version #4278
• chore(config): migrate hostname #4271
• chore(config): migrate logDirectory #4267
• chore(config): migrate statsComputationEnabled #4265
• chore(config): migrate noDebugStack #4264
• chore(config): migrate spanTimeout #4263 👈 (View in Graphite)
• chore(config): migrate debugAbandonedSpans #4262
• chore(config): migrate dynamicInstrumentationEnabled #4261
• chore(config): migrate partialFlushMinSpans #4260
• chore(config): migrate partialFlushEnabled #4259
• chore(config): migrate first chunk tracer configs #4258
• chore(config): migrate globalSampleRate and introduce configProvider.getFloatWithValidator #4257
• chore(config): migrate logToStdout and isLambdaFunction #4256
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-19 17:26:25

Comparing candidate commit f74672a in PR branch 12-12-migrate_spantimeout with baseline commit c8b32da in branch 12-12-migrate_debugabandonedspans.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 9 metrics, 0 unstable metrics.

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: f74672a | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[codecov]

Codecov Report

❌ Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.53%. Comparing base (c8b32da) to head (f74672a).

Files with missing lines	Patch %	Lines
internal/config/config.go	9.09%	10 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ddtrace/tracer/option.go	84.15% <100.00%> (-0.06%)	⬇️
ddtrace/tracer/tracer.go	86.40% <100.00%> (ø)
internal/config/config.go	24.63% <9.09%> (-1.02%)	⬇️

... and 1 file with indirect coverage changes

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