These library files are access and loaded during runtime when the Virtual SAN Observer page is rendered. The tool requires access to the libraries mentioned above in order to work correctly. This means that the vCenter Server requires access to the internet. This requirement can potentially present a challenge in secured environments where applications with access to the internet is not be a practical form of operation and its not allowed.
Many vSphere admins have encountered this issue. In particular, those supporting secured environments. In order to overcome this issue, the vCenter Server Appliance can be modified so that it can access the required files and library locally.
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For more information on Virtual SAN Observer download the white paper Monitoring VMware Virtual SAN with Virtual SAN Observer.
Special thanks to our awesome engineers Mousumi Mullick and Christian Dickmann for helping out with all of this Virtual SAN Observer greatness!!
For future updates on Virtual SAN (VSAN), Virtual Volumes (VVols), and other Software-defined Storage technologies as well as vSphere + OpenStack be sure to follow me on Twitter: @PunchingClouds