OTEL metrics in backend server

[nissessenap]

Is your feature request related to a problem? Please describe.

When you start running cq as a server you want to emit metrics for debbuging. But I also want to get an notification when to many kus are pending for review. I don't think cq should start generating notifications, so a simple way to solve this is to just use metrics systems that I assume most people already do.

Describe the solution you'd like

I have described it in detail in an RFC but in short I want to use OTEL SDK

Describe alternatives you've considered

• Build a notfication tool in cq
• Have your monitoring tool perform SQL queries (this is a dangerous feature and grafana don't recommend doing it)

Additional Context

No response

Self-Checklist

• I have read the Contributing Guidelines.
• I have searched the existing issues and found no duplicate.
• I have provided a clear and concise description of the problem.
• I have provided a clear and concise description of the proposed solution.