If you're interested in actual process health, that's not something you're able to get AFAIK using AppMon agents. Most LDAP, DNS, and DHCP services are native and therefore would need custom instrumentation to get full depth in your PurePath. If, however, you're interested in general performance of these services there are numerous ways to do this.
For example, you can chart DNS resolution times if you have UEM data and then set thresholds for this time for your application. You can use the Availability Monitoring plugin to get a binary status of your DNS server. You can utilize other plugins similarly.
You're also able to get general host-level monitoring data if you have a license for the Host Agent and don't have another agent on that same linux box. If you have a web server agent on this box, you're able to get this information.
Does that help?