DNS probe options
host (Default:"") DNS name that should be resolved.
record-type (A AAAA MX NS; Default: A) Record type that will be used for DNS probe.
dns-server
Question: There is no indication how often this probe is run. No indication of interval or anything?????
( Does one have to set the interval manually, and assume no defaults for this particular probe? )
( If so, what would be a reasonable interval to make sure DNS is working? )