Migrate system_usage_data_monthly from usage_data.rb
As a part of the effort to remove usage_data.rb
file we can now remove system_usage_data_monthly
method.
As the outcome we need to have:
- the subject method and associated specs to be removed
- instrumentation classes with specs created for both metrics
- metrics definition updated to enable usage of the classes
Edited by Niko Belokolodov