In an earlier PR, we moved logic from process_view to process
request, so mapping would happen earlier in the middleware
lifecycle, and the code_owner metric would be set for requests
that never made it to process_view.
The temp_view_func_compare custom metric was added temporarily to
ensure this earlier refactor did not introduce any unaccounted for
differences. It did not, so we are removing this temporary metric.
ARCHBOM-1263
* includes ADR for Monitoring by Code Owner
* add monitoring middleware to add the following custom metrics:
- code_owner: The owning team mapped to the current view.
- code_owner_mapping_error: If there are any errors when trying to
perform the mapping.
- view_func_module: The __module__ of the view_func, which can
be used to find missing mappings.
* add script to generate `settings.CODE_OWNER_MAPPINGS` from
a csv file.
ARCHBOM-1244
