Handle edge cases in monitoring

**Problem**
When working with parsers, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

No files, tests, or parser entry points are named in the issue. Start by locating the parsers and their current error-handling paths, then identify which edge cases need more descriptive messages. Done means the affected errors provide useful debugging context and coverage exists for the updated cases.

Written by the indexing model from the issue text.