As someone configuring a yaml file, I would like to specify which metrics are mandatory and which are optional

[sergioespana]

Then, of course, the indicators that depend on an optional metric, should only show information if the value for the metric has been provided by the auditor

[nielsrowinbik]

This is already (partly) implemented: indicators that cannot be computed because of incomplete data are not shown. There is no distinction between optional and required metrics, since that would require all required data to be entered at once. At least in my opinion, it should be possible to build the dataset for a report bit by bit. Would you agree?

[sergioespana]

I agree. For the moment, the approach you mention is appropriate.

Later on, when there is a more formal procedure and an explicit submission is required, then mandatory elements have to be managed differently because they should raise an error and not allow the official submission of the report.