Add rate limiting for filtering

**Description**
Currently parsers lacks proper monitoring support.

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

**Priority**: Low/Medium

Start by locating the parser and filtering entry points, then inspect any existing monitoring configuration or defaults. Clarify how rate limiting fits the filtering flow and what monitoring signals are required; done means configurable monitoring with sensible defaults and rate limiting for filtering.

Written by the indexing model from the issue text.