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Hello.
As you know, Route53 health checks use HTTP, HTTPS, TCP, etc.
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/health-checks-creating-values.html
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-simple-configs.html
You create health checks for the resources that you can't create alias records for, such as EC2 instances or servers in your own data center. You specify how to send health-checking requests to the resource: which protocol to use (HTTP, HTTPS, or TCP), which IP address and port to use, and, for HTTP/HTTPS health checks, a domain name and path.
Therefore, if you want to monitor a protocol that uses UDP, you will need to create a monitoring mechanism using Lambda etc. for separate monitoring.
As Riku mentioned, Route53 health checks do not support UDP.
One option is to do TCP check on a TCP service on your server. This can be HTTP web server on port 80, or perhaps syslog on TCP 514. You will need to enable Syslog TCP for the latter option.
You can configure your server firewall (or EC2 security group) to restrict inbound TCP access to Route 53 Health Check IP prefixes only.
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