Symantec Endpoint Protection/Security (SEP/SES) agent tries to access to metadata.google.internal, 169.254.169.254 and 188.8.131.52.
This behavior is by design. It tries to get instance ID information of some cloud infrastructure, such as Google Cloud Platform, AWS and Oracle Cloud Infrastructure. The PCH module of the agent does the lookups to see if it's running on a cloud service VM or not.
PCH module is active on both hybrid as well as cloud-managed clients.
There is no option to disable these activities.