Logs for the probe:
time=2026-07-11T10:56:37.713Z level=ERROR source=query_response.go:120 msg="Error reading from connection" module=smtp_banner target=91.184.248.13:25 err="read tcp4 10.244.0.169:34574->91.184.248.13:25: i/o timeout"
time=2026-07-11T10:56:37.713Z level=ERROR source=handler.go:130 msg="Probe failed" module=smtp_banner target=91.184.248.13:25 duration_seconds=9.500512835



Metrics that would have been returned:
# HELP probe_dns_lookup_time_seconds Returns the time taken for probe dns lookup in seconds
# TYPE probe_dns_lookup_time_seconds gauge
probe_dns_lookup_time_seconds 7.435e-06
# HELP probe_duration_seconds Returns how long the probe took to complete in seconds
# TYPE probe_duration_seconds gauge
probe_duration_seconds 9.500512835
# HELP probe_failed_due_to_bytes Indicates if probe failed due to bytes
# TYPE probe_failed_due_to_bytes gauge
probe_failed_due_to_bytes 0
# HELP probe_failed_due_to_regex Indicates if probe failed due to regex
# TYPE probe_failed_due_to_regex gauge
probe_failed_due_to_regex 0
# HELP probe_ip_addr_hash Specifies the hash of IP address. It's useful to detect if the IP address changes.
# TYPE probe_ip_addr_hash gauge
probe_ip_addr_hash 7.68569941e+08
# HELP probe_ip_protocol Specifies whether probe ip protocol is IP4 or IP6
# TYPE probe_ip_protocol gauge
probe_ip_protocol 4
# HELP probe_success Displays whether or not the probe was a success
# TYPE probe_success gauge
probe_success 0



Module configuration:
prober: tcp
timeout: 10s
http:
  ip_protocol_fallback: true
  follow_redirects: true
  enable_http2: true
tcp:
  preferred_ip_protocol: ip4
  ip_protocol_fallback: true
  query_response:
  - expect: '^220 '
  - send: QUIT
icmp:
  ip_protocol_fallback: true
  ttl: 64
dns:
  ip_protocol_fallback: true
  recursion_desired: true