Log analytics are 15% of the TRE operation costs

[cptanalatriste]

✅ Checklist

• I have searched open and closed issues for duplicates.
• This is a request for a new feature in the Data Safe Haven or an upgrade to an existing feature.
• The feature is still missing in the latest version.
• I have read through the documentation.
• This isn't an open-ended question (open a discussion if it is).

🍓 Suggested change

Log analytics can represent 15% (or more) of the cost of operating a DSH TRE:

The log analytics costs are in purple. For example, in a day of operations that cost 90GBP, 14GBP are for log analytics. We believe this can be improved.

🚂 How could this be done?

There are many Azure Monitor configuration options that can reduce the costs. Maybe we can expose those options in the configuration file, so Admins can tailor them accoding to their needs.