Using AWS Global Accelerator service to distribute traffic across multiple regions

Yes, AWS Global Accelerator (AGA) can help you achieve the functionality you described for load balancing HTTP notification requests across multiple regions.

To set this up using AGA, you can follow these steps:

1. Create a listener on AGA for the HTTP port (port 80) and assign a static IP address to it.
2. Create endpoints for each of the microservices running in different regions, and associate them with the listener.
3. Configure endpoint groups for each region and associate the relevant endpoints with the corresponding endpoint groups.
4. Create a traffic dial for each endpoint group to control the amount of traffic that is routed to each region.
5. Update the DNS record for your FQDN to point to the static IP address assigned to the AGA listener.

By following these steps, you can have one URL (FQDN) exposed that maps to one static IP address listening on port 80. When an HTTP notification request is received, AGA will route the request to the appropriate endpoint group based on the configured traffic dials. This ensures that the load is balanced across all microservices running in different regions.

Note that AGA alone can provide the load balancing and traffic routing functionality you require, and no additional services are needed. However, you may need to ensure that your microservices are designed to handle traffic from different regions and that they are deployed in a highly available and fault-tolerant configuration to ensure maximum uptime and performance.