Handle edge cases in logging

**Description**
Currently middleware lacks proper serialization support.

**Proposed solution**
Add configurable serialization with sensible defaults.

**Priority**: Low/Medium

No files, tests, or entry points are named. Start by locating the middleware logging path and any existing serialization or logging tests, then determine the supported configuration and defaults from the surrounding code; done means middleware output serializes reliably for the identified edge cases with tests covering the behavior.

Written by the indexing model from the issue text.