Add explaination for try-catch

Author: rads-1996

opentelemetry-api/src/opentelemetry/attributes/__init__.py

@@ -180,6 +180,11 @@ def _clean_extended_attribute_value(  # pylint: disable=too-many-branches
         # Freeze mutable sequences defensively
         return tuple(cleaned_seq)
 
+    # Some applications such as Django add values to log records whose types fall outside the
+    # primitive types and `_VALID_ANY_VALUE_TYPES`, i.e., they are not of type `AnyValue`.
+    # Rather than attempt to whitelist every possible instrumentation, we stringify those values here
+    # so they can still be represented as attributes, falling back to the original TypeError only if
+    # converting to string raises.
     try:
         return str(value)
     except Exception: