Amazon CloudWatch Synthetics now supports monitoring private endpoints in a VPC
Customers can now use Amazon CloudWatch Synthetics to monitor their private endpoints that run in a virtual private cloud (VPC). Microservices, APIs, or internal web tools inside a private network often power customer-facing websites and applications. Further, there are several critical internal applications such as for accounting, collaboration tools, corporate email, and payroll that have a direct impact on increased productivity for your organization. Continuously monitoring both internal and external endpoints using synthetic monitoring is vital to ensure smooth operations on a consistent basis.
Source:: Amazon AWS