DNS

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The DNS monitor checks the correctness of DNS records and domain resolution.

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How it works

1. The system performs a DNS query for the specified domain
2. Checks the presence and value of DNS records
3. If the conditions are not met — a notification is sent

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Parameters

Description

Parameter	Description	Required
Name	Unique monitor name	Yes
Description	A note about the task purpose	No

Details

Parameter	Description	Default
Domain	IP address or domain	-
Timeout	Maximum response wait time	10 seconds
Retries	Number of retries on error	3

Checks

The DNS monitor supports various response checks:

tip

For MX records the metric is specified through a colon, as in the screenshot above.

Regions

Choose one or more regions for the check. The monitor will send requests from each selected region at the specified interval.

Parameter	Description	Default
Interval	Check frequency	5 minutes

Notifications

Here you can specify contact groups for notifications. If left unspecified, the user's email is used.

You can also set a waiting period — Grace Period. It is added to the expected time of the next signal. For example, if the interval is 5 minutes and the Grace Period is 2 minutes, the alert will be sent 7 minutes after the last signal. Repeated notifications remind you of the problem; you can set the interval and number of these reminders.

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DNS record types

The DNS monitor supports checking the following record types:

Type	Description	Example value
A	IPv4 address	93.184.216.34
AAAA	IPv6 address	2606:2800:220:1:248:1893:25c8:1946
CNAME	Canonical name (alias)	www.example.com
MX	Mail server	mail.example.com.:10
TXT	Text record	v=spf1 include:_spf.google.com ~all
NS	Name server	ns1.example.com
SOA	Start of Authority	—
PTR	Pointer (reverse DNS)	example.com
SRV	Service record	0 5 5269 xmpp.example.com
CAA	Certification Authority Authorization	0 issue "letsencrypt.org"