[Hackathon] feat(traces): estimate climate impact from span duration - #122363
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Replace the 1g/span placeholder with a simple POC model: duration_ms treated as active CPU time at 15W and 400 gCO2e/kWh. Co-Authored-By: Josh Goldberg <joshua.goldberg@sentry.io> Co-Authored-By: Prajjwal Bhandari <prajjwal.bhandari@sentry.io>
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Co-Authored-By: Prajjwal Bhandari <prajjwal.bhandari@sentry.io>
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Part of the climate-impact hackathon POC. Stacked on #122327.
What
Replaces the
1.0 g/spanplaceholder with a simple duration-based model:The implementation handles the two response shapes used here: top-level
durationfor trace results andspan.durationinside trace-item attributes.Why this shape
The span schema has no CPU-time field. Wall duration is the closest existing proxy, so the POC can ship without SDK or schema changes.
The constants stay fixed to keep comparisons deterministic without hardware experiments or location-aware grid data:
Unknown duration omits the estimate instead of returning
0, because the frontend uses field presence as the availability signal.Limitations
Wall time is not CPU time. Parent and child span durations can overlap. This is a relative POC estimate, not inventory-grade accounting.
Tests
Adds focused unit coverage for the formula, both payload shapes, missing data, tree annotation, trace summaries, and trace-item details. Endpoint tests now assert duration-derived values.
Requested by Prajjwal Bhandari.
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