The specs listed in the datasheet are unfortunately a requirement, both for getting support and it is a technical limitation. Cisco doesn't have any alternative products(ignoring Prime due to becoming obsolete).
If you want something free open source you might want to look at Zabbix or LibreNMS for metrics monitoring and graylog for log collection. I am unfortunately not aware of any good centralized management other than the ones listed for small quantities of devices.
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