The summary.csv file contains one row for each domain, and summarizes the distribution of topology between the domains. The file has the following columns of information:

Name of the domain

Number of devices that the domain owns
Devices for which the domain has the primary responsibility for management.

Number of ports on owned devices

Number of interfaces on owned devices

Topology Split Manager weight metric for the owned devices

Number of devices that the domain proxies
Devices for which the domain has a partial responsibility for management.

Number of ports on proxied devices

Number of interfaces on proxied devices

Topology Split Manager weight metric for the proxied devices

Total of the owned and proxied weight metrics

Percentage relative to an equal share of the weights that this domain contains.
That is, for a perfect split, each domain would carry exactly 100% of their fair share of the weight. Realistically, some domains will carry more than their fair share (>100%) and other will carry less (<100%). The closer these numbers get to 100% across all domains, the more evenly distributed the load becomes across the domains.