Add global metadata attributes to diagnostic output files

[aidanheerdegen]

ACCESS-NRI would like the capability to embed global metadata attributes into diagnostic ouput files.

Specifically we want to add unique tracking IDs to model diagnostic (and tracer) outputs to create a full experiment provenance chain that would enable users to discover experiment metadata.

Ideally there would be a config file where any global attribute could be set. A fallback option would be dedicated namelist options for setting specific global metadata attributes.

For background see this related issue for the tool we're using to run our models:

payu-org/payu#510

FMS1 has the mpp_write_meta routine that could be used for this purpose.

Has anyone done anything of this nature before?