The probes in this section monitor various services integral to a functioning network. When applying them, ensure that their timed thresholds do not exceed the amount of time allotted to the timeout period. Otherwise, an UNKNOWN status is returned in all instances of extended latency, thereby nullifying the thresholds.
A.8.1. Network Services::DNS Lookup
The Network Services::DNS Lookup probe uses the
dig command to see if it can resolve the system or domain name specified in the Host or Address to look up field. It collects the following metric:
This is useful in monitoring the status of your DNS servers. To monitor one of your DNS servers, supply a well-known host/domain name, such as a large search engine or corporate Web site.
Table A.37. Network Services::DNS Lookup settings
| Field || Value |
| Host or Address to look up || |
| Timeout* || 10 |
| Critical Maximum Query Time || |
| Warning Maximum Query Time || |