This article confirms that the files /etc/sysconfig/proxy and /etc/sysconfig/netdumper are legitimate configuration files used in the vCenter Appliance and explains their purpose.
VMware vCenter Server
The files /etc/sysconfig/proxy and /etc/sysconfig/netdumper are legitimate system files created on the vCenter Server Appliance.
/etc/sysconfig/proxy is the proxy configuration file in the vCenter appliance/etc/sysconfig/netdumper is the configuration file on the vCenter appliance for ESXi dump collectorFor more information, please refer to the below KB articles.
How to configure proxy settings for vCenter Server
Configuring the Network Dump Collector service in vSphere