docs(logs): clarify attribute value types for Python logs

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>

Author: sergical

platform-includes/logs/usage/python.mdx

@@ -30,3 +30,9 @@ sentry_sdk.logger.error(
     }
 )
 ```
+
+<Alert title="Attribute value types">
+
+Attribute values should be primitives — strings, numbers, or booleans. Sentry's log storage only retains these scalar types, so other values are handled inconsistently: a `list` or `tuple` of same-typed scalars (for example `[1, 2, 3]`) is sent as an array, which is **not currently stored** and shows up empty in the Logs UI, while mixed lists and `dict`s are stored as their string representation. To keep a complex value searchable, serialize it to a string yourself before logging — for example `json.dumps(workflow_ids)`.
+
+</Alert>