A better generic approach to Diagnostics policies

For a comprehensive overview of the topic, you can read the full post at the following link. Below is a brief summary of Morten's key points:

Maintaining azure diagnostic policies can be a bit of a slog, as existing approach often have a splattering of hardcoded values that need to be cared for.

With this in mind, I tried to look at the problem and come up with a better way of organizing the content of these policies.

• Put all metric and log categories as parameters, and if any changes to these occur. One only need to edit and add/remove categories from a parameter in the given policy.
  

• New diagnostic policy for azure service, is much easier using the framework below. Only need to edit and add service type (<serviceType>) and metric/log categories supported for service.
  

• Not needing to delete assignment to update policy definition when changes to metric/log category occurs.