Edgesight for NetScaler uses an agentless mechanism

Citrix EdgeSight for NetScaler Installation Guide

http://support.citrix.com/article/CTX126420

Citrix EdgeSight for NetScaler Administrator's Guide

http://support.citrix.com/article/CTX126418

EdgeSight Agent Worker Function Log Files Explained

http://support.citrix.com/article/CTX112209

For an EdgeSight user to access real-time data, the browser must be able to contact the EdgeSight agent on port 9035.