feat(attributes): Add CPython garbage collection conventions

[sentrivana]

Description

Adds conventions for spans that represent a run of the CPython garbage collector. These will be emitted by an upcoming GC integration in the Python SDK, which hooks into gc.callbacks and creates a child span of the active span for each (by default: full) collection.

Attributes (model/attributes/cpython/, all integers):

• cpython.gc.generation: the generation that was collected. Defined in OTel, so is_in_otel: true. Has a note about free-threaded builds, where the GC isn't generational: every collection is a full one, automatic collections report generation 0.
• cpython.gc.collected_objects: the number of objects collected in a single run.
• cpython.gc.uncollectable_objects: the number of uncollectable objects found in a single run.

OTel only defines cpython.gc.collected_objects and cpython.gc.uncollectable_objects as counter metrics (totals since interpreter start), not as attributes, so the two count attributes are is_in_otel: false and have a note pointing out the difference.

Op: a new runtime category with a gc op. None of the existing categories fit, and other runtime ops could live there in the future.

Span name: a runtime name convention mapping the gc op to the static name Garbage collection.

PR Checklist

• I have run yarn test and verified that the tests pass.
• I have run yarn generate to generate and format code and docs.

If an attribute was added:

• The attribute is in a namespace (e.g. nextjs.function_id, not function_id)
• I have used the correct value for apply_scrubbing (i.e. manual or auto. Use never only for values that should never be scrubbed such as IDs)

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Project	Deployment	Actions	Updated
sentry-conventions	Ready	Preview	Oct 16, 2026 10:29am UTC

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Semver Impact of This PR

🟡 Minor (new features)

📋 Changelog Preview

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New Features ✨

Attributes

• Add CPython garbage collection conventions by sentrivana in #719

• Add http.request.duration by loewenheim in #697

Other

• (names) Add queue.publish/create/receive/process/settle to messaging span names by pabloDeputter in #705
• (ops) Add object.copy op by pabloDeputter in #706
• Add view.render op by alexander-alderman-webb in #699

Bug Fixes 🐛

• (attributes) Apply consistent scrubbing across deprecations by mjq in #692

Internal Changes 🔧

• (repo) Update CODEOWNERS to include @giortzisg by Lms24 in #708
• Add deprecated messaging ops set by the Python SDK by alexander-alderman-webb in #693
• Add view.response.render op, deprecated in favor of view.render by alexander-alderman-webb in #700
• Add event.django op, deprecated in favor of function by alexander-alderman-webb in #698

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