Configure Azure LoadBalancer(HaProxy)

Need below information :

1. Why do we require credential of the system while configuring HA proxy ? Ref Link : https://thwack.solarwinds.com/t5/SAM-Documents/Haproxy/ta-p/537911

2. Can it work with HA proxy username and pwd(read-only) ? or can we monitor it by snmp ?

3. Does Azure HaProxy also require system credential or Point No. 2 will or ?