[Feature Request] Add user connection event counter to prometheus metrics for each proxy.

[RuySalgado]

Describe the feature request

Would be useful to keep track of DNS queries and request in general between different proxies.

Describe alternatives you've considered

No response

Affected area

• Docs
• Installation
• Performance and Scalability
• Security
• User Experience
• Test and Release
• Developer Infrastructure
• Client Plugin
• Server Plugin
• Extensions
• Others

[github-actions]

Issues go stale after 14d of inactivity. Stale issues rot after an additional 3d of inactivity and eventually close.