Jim, if you are upgrading from OCUM 7.1 to 7.2 only, and you don't have an OPM 7.1 instance, this article is not applicable. Once you upgrade OCUM 7.1 to 7.2, it will start the performance data collection and provide performance monitoring and troubleshooting functionality. If you have OPM 7.1 instance and you care about the historic performance data, you can follow this article and migrate OPM perf data into OCUM 7.2.
Talking about the capacity/utilizaition history, if this is OCUM capacity/utilizaition, it's not related to the article. If this OPM perf capacity/utilizaition history, yes, the migration will migrate it. Hope this clarifies.