The first generation of our DNS monitor did simple A record queries. Good enough to get the basic records necessary for life on the Internet, and quickly we had many requests to expand the types of records available. Based on these requests we have added CNAME and PTR records to the DNS monitoring roster.
We have also added a new option for DNS monitoring.
Sometimes the answer for a DNS query is unknown (dynamically changing environments) or out of your control (recursive server). Still it is important to know that the DNS query is working. When the Inspect answers flag is unchecked the DNS monitor will accept any valid response as a successful test making it possible to monitor the DNS server, even if the answer is not known.