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DocumentationGrafana CloudTesting and syntheticsSynthetic MonitoringCreate checksCheck typesDNS check
Grafana Cloud
DNS check
DNS or domain name servers resolve a domain such as grafana.com to an IP address. This check ensures a domain resolves and measures the average time for the resolution to happen. DNS checks can be set up to validate against a specific DNS server and check for a specific kind of response.
Options
The list of common options to all check types:
Option | Description |
---|---|
Enabled | Whether the check is enabled or not. |
Job name | Refer to the check name. Check metrics include a job label with the value of this option. |
Target | Target of the check request. Check metrics include an instance label with the value of this option. |
Probe locations | The locations where the check should run from. Check metrics include a probe label with the value of the probe location running the check. |
Frequency | The frequency the check should run in seconds. The value can range from 60 to 3600 seconds. Only the sm_check_info metric includes the frequency label. |
Timeout | Maximum execution time for the check. The value can range from 1 to 60 seconds. |
Custom labels | (Optional) Custom labels applied to check metrics. Refer to Custom labels for querying instructions. |
Additionally, DNS checks have the following options:
Option | Description |
---|---|
Record type | The resource record to query. |
Server | The nameserver to query. |
Port | The port used to connect to the server. |
Protocol | The protocol (TCP, UDP) used to connect to the server. |
Valid response codes | The set of response codes to accept. |
Valid response matches | A series of validations to apply to the response. |
IP version | The internet protocol version to use (V4, V6 or any). |
Publish full set of metrics | Whether to publish additional metrics to create histograms (used for Apdex scores or heatmaps). Default is false to reduce the number of active series. |
These last options don’t produce any additional labels in the resulting check metrics.
Metrics
Checks store their results as Prometheus metrics, including the list of common metrics:
Metric | Description |
---|---|
probe_all_duration_seconds | Returns how long the probe took to complete in seconds (histogram). |
probe_duration_seconds | Returns how long the probe took to complete in seconds. |
probe_all_success | Displays whether or not the probe was a success (summary). |
probe_success | Displays whether or not the probe was a success. |
sm_check_info | Provides information about a single check configuration. |
Additionally, DNS checks produce the following metrics:
Metric | Description |
---|---|
probe_dns_additional_rrs | Returns the number of entries in the additional resource record list. |
probe_dns_answer_rrs | Returns the number of entries in the answer resource record list. |
probe_dns_authority_rrs | Returns the number of entries in the authority resource record list. |
probe_dns_duration_seconds | Duration of DNS request by phase. |
probe_dns_lookup_time_seconds | Returns the time taken for probe DNS lookup in seconds. |
probe_dns_query_succeeded | Displays whether or not the query was executed successfully. |
probe_ip_addr_hash | Specifies the hash of the IP address. It’s useful to detect if the IP address changes. |
probe_ip_protocol | Specifies whether probe IP protocol is IP4 or IP6. |
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