feat: metrics demo

[phv2312]

Description

• Please include a summary of the changes and the related issue.
• Fixes # (issue)

Type of change

• [ ] New features (non-breaking change).
• [ ] Bug fix (non-breaking change).
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected).

Checklist

• [ ] I have performed a self-review of my code.
• [ ] I have added thorough tests if it is a core feature.
• [ ] There is a reference to the original bug report and related work.
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] The feature is well documented.