Observability for all the components

[JorTurFer]

We have to implement and document observability metrics for all the components:

• [ ] Operator
• [x] https://github.com/kedacore/http-add-on/issues/910
• [ ] External Scaler
• [ ] https://github.com/kedacore/http-add-on/issues/354
• [x] https://github.com/kedacore/http-add-on/issues/1031

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