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

platform-includes/logs/best-practices/python.mdx

@@ -69,7 +69,8 @@ sentry_sdk.logger.info(
 
         # Business context
         "order_value": 149.99,
-        "feature_flags": ["new-checkout", "discount-v2"],
+        # Join lists into a string — array values aren't stored as attributes
+        "feature_flags": ",".join(["new-checkout", "discount-v2"]),
     }
 )
 ```

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>