docs(logs): clarify attribute value types for Python logs#17921
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Log attribute values must be primitives (string/number/boolean) to be stored. Same-typed scalar lists are sent as arrays that aren't currently retained (they appear empty in the Logs UI), while mixed lists and dicts are stored as their string representation. Document this and recommend serializing complex values (e.g. json.dumps) before logging. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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The "Include Business Context" example showed feature_flags as a raw list, which the Python SDK drops on ingestion (arrays aren't stored as attributes). Show the join-to-string pattern instead so the example actually works. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
KyleTryon
approved these changes
Jun 1, 2026
sfanahata
reviewed
Jun 2, 2026
Co-authored-by: Shannon Anahata <shannon.anahata@gmail.com>
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Summary
Clarifies which value types are supported for Python log attributes, after a user reported that array-valued attributes (e.g.
list[int]likeworkflow_ids/detector_ids) silently show up empty in the Logs UI.Findings (validated against a real project)
Sentry's log storage (EAP) only retains scalar attribute types — string, number, boolean. The Python SDK (
sentry_sdk.utils.format_attribute) sends a homogeneous scalarlist/tupleas a real array, which the backend does not store, so it appears empty. Mixed lists anddicts arerepr'd to strings and do survive. (For contrast,@sentry/corestringifies all non-primitives viaserializeAttributes(attrs, true), so JS users see arrays as JSON strings — the two SDKs diverge here.)Change
Adds an
<Alert>to the Python logs usage include documenting that attribute values should be primitives, explaining the array behavior, and recommending serializing complex values (e.g.json.dumps(...)) before logging.A separate
sentry-pythonissue tracks the SDK-level inconsistency.🤖 Generated with Claude Code