dns_latency — DNS resolution latency

Free tier. Measures resolution latency for a set of names — through the operating system's resolver by default, or against explicit DNS servers to compare them. Slow DNS is a frequent cause of perceived slowness (logon time, application launch, share access).

Quick start

# probes.d/50-dns.yaml
- name: dns-checks
  type: dns_latency
  params:
    names: ["intranet.corp.lan", "www.example.com"]
    resolvers: ["10.0.0.53", "1.1.1.1"]   # optional; omit for the system resolver
    interval: 60

Parameters

Parameter	Default	Description
names	required	Names to resolve
resolvers	system	DNS servers (ip or ip:port); each name is measured against each resolver
timeout	5	Per-lookup budget in seconds
interval	60	Seconds between cycles

Metrics

One series per (name, resolver) pair — resolver is system when no explicit servers are configured.

Metric	Unit	Description
senhub.dns.up	bool	Lookup answered within the timeout
senhub.dns.lookup.duration	ms	Resolution time (only when up)
senhub.dns.answers	count	Addresses returned

A failing lookup is a measurement (up = 0), never a probe failure.