Fix JSON span event encoding in v1 payloads.

[AlexeyKuznetsov-DD]

What Does This Do

Parses the existing events JSON tag in TraceMapperV1 and encodes span events into the native v1 MessagePack span_events field.

Motivation

OpenTelemetry span events are stored as JSON, while TraceMapperV1 only handled pre-parsed List values. This caused v1 payloads to contain an empty span_events array.

Additional Notes

This is a focused compatibility fix.

[AlexeyKuznetsov-DD]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: 6680c2bb18

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[datadog-prod-us1-6]

🎯 Code Coverage (details)
• Patch Coverage: 84.62%
• Overall Coverage: 58.01% (+0.23%)

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🔗 Commit SHA: 7d2c4af | Docs | Datadog PR Page | Give us feedback!}

[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	13.98 s	14.00 s	[-0.9%; +0.5%] (no difference)
startup:insecure-bank:tracing:Agent	12.91 s	13.03 s	[-1.6%; -0.2%] (maybe better)
startup:petclinic:appsec:Agent	16.97 s	16.87 s	[-0.2%; +1.5%] (no difference)
startup:petclinic:iast:Agent	16.95 s	17.01 s	[-1.3%; +0.6%] (no difference)
startup:petclinic:profiling:Agent	16.30 s	16.99 s	[-8.3%; +0.2%] (no difference)
startup:petclinic:sca:Agent	16.72 s	16.59 s	[-0.0%; +1.6%] (no difference)
startup:petclinic:tracing:Agent	16.21 s	16.22 s	[-1.1%; +1.0%] (no difference)

Commit: 7d2c4afc · 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-prod-us1-6]

More details

The JSON span-event path preserves the existing v1 filtering and encoding behavior while converting the OpenTelemetry tag into native span_events; malformed or non-array input falls back to an empty array without leaking the tag into attributes. Local Gradle execution was blocked by the unavailable Java 25 toolchain.

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 6680c2bb18

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[AlexeyKuznetsov-DD]

/merge

[gh-worker-devflow-routing-ef8351]

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2026-07-30 23:20:40 UTC ℹ️ Start processing command /merge

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2026-07-30 23:20:45 UTC ℹ️ MergeQueue: pull request added to the queue

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

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2026-07-31 00:54:17 UTC ℹ️ MergeQueue: This merge request was merged