Support monitoring configuration

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

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

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

The issue names no files, tests, or entry points. First clarify which monitoring configuration errors are in scope and where configuration handling lives; done means error messages are more descriptive and detailed enough to support debugging and maintenance.

Written by the indexing model from the issue text.