[v11] Manual test Mastra

[RulaKhaled]

Manual check that Mastra agent monitoring still looks right against SDK v11 (11.0.0-alpha.1 or newer). Mastra ships its own Sentry exporter rather than living in sentry-javascript, so this is a customer-path / exporter-compat pass — not covered by the greenfield wizard tickets under JS-3386.

Why

v11 renamed gen_ai attributes, dropped some legacy ones, and is moving agent span names to low cardinality. Mastra was not part of the in-repo AI integration updates (JS-3110). Need to confirm the exporter still produces usable traces, or file follow-ups if it is still emitting v10 names/attributes.

Protocol

• App lives outside the sentry-javascript monorepo
• Pin @sentry/node@alpha (and whatever Mastra Sentry/OTEL packages the current docs recommend)
• Run a small Mastra agent that invokes a model and at least one tool
• Send traces to a real Sentry project (personal free org is enough — not the employee sentry org)
• Confirm errors still capture if the agent throws

Check

• Agent / tool / inference spans still show up
• Span ops and names match v11 conventions (no leftover v10 gen_ai.* names that dashboards would miss)
• Attributes use the v11 names (gen_ai.provider.name, gen_ai.tool.definitions, gen_ai.tool.call.arguments / result, cache token paths, gen_ai.pipeline.name if applicable) — note anything still on the old names
• Span streaming on; no sendDefaultPii; dataCollection looks right
• File follow-ups (Mastra exporter and/or docs) if the exporter is still on v10 conventions

[linear-code]

JS-3454