The DNS Server monitor tests are improved with the additional Health check Allowed DNS Results. This field allows the user to configure the list of expected values, which depend on the selected DNS Record Type:

• If the DNS Record Type is “A” or “AAAA”, this field allows the user to configure the list of IP addresses that are considered “healthy” for the resolved IP address of the testing DNS query. If the DNS Server monitor test query resolves to multiple IP addresses, they should all be part of the configured list. If the resolved IP addresses are not in the allowed list, the test Health will be set to Critical.
• If the DNS Record Type is “CNAME*”,* the field allows the user to specify a comma-separated list of canonical name records that are considered "healthy”.
• If the DNS Record Type is “NS”, the field allows the user to specify a comma-separated list of server names that are considered "healthy”.

The following screenshot shows the Allowed DNS Results field in the DNS Server monitor configuration.