Document user data toggle and conversation title in Agent Builder traces

[charlotte-hoblik]

Summary

Documents two 9.6 additions to Agent Builder trace collection, both already live on Serverless:

• agentBuilder:tracing:includeUserData (kibana#282858) — new privacy toggle recording user.id and user.name, replacing the user.hash kept by default.
• elastic.conversation.title (kibana#281166) — conversation title span attribute, gated by includeRealNames.

kibana#281166 also renamed the includeRealNames setting, so that row is version-scoped rather than overwritten. The page covers 9.5+ and both labels have to coexist.

collect-traces.md

• New includeUserData row, scoped stack: ga 9.6+ / serverless: ga.
• includeRealNames row carries both the 9.5 and 9.6 labels. Corrected its effect: it also governs workflow names, tool definitions and tool descriptions, and rewrites span names.
• Noted that includeRealIds also controls the agent ID and workflow execution ID, which its label omits.
• Added the conversation round span to the span content list. It is the only span carrying the title and user fields.
• Documented attributes.kibana.inference.root as the way to select it, since generate_title is also a CHAIN span and carries neither.
• Anonymization note now gives the concrete ID formats, and flags that user.id is the one case where anonymizing changes the field name.
• Noted that setting changes affect new traces only.
• New screenshot and alt text, seven toggles.

agent-traces-dashboard.md

• New User attributes section with the three fields and their required settings.
• attributes.user.hash is stable per user, so per-user dashboards work without enabling user data.
• Added elastic.conversation.title and kibana.inference.root to the attribute reference.
• Noted that span.name is anonymized along with the attributes.

Relates to elastic/docs-content-internal#1621

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🔍 Preview links for changed docs

• explore-analyze/ai-features/agent-builder/agent-traces-dashboard.md
• explore-analyze/ai-features/agent-builder/collect-traces.md

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