What is filebeat?
When installed, it runs as a background service in windows/Linux systems.
occasionally we want to check the service(filebeat) if it working as expected or not?
Can Appmon Monitor such services?
Yes you can. You'll want to use a System Monitor plugin.
Depending on which protocols FileBeat supports, one of the existing plugins might suffice, or you can take the source and modify as needed. For example, if FileBeat supports FTP, then the FTP File Checker Plugin might just work out of the box. Otherwise it's a good starting point to modify to suit your needs.