Logs for the probe:
time=2026-09-09T05:44:31.466Z level=ERROR source=query_response.go:125 msg="Regexp did not match" module=smtp_starttls target=mail.906.sh:25 regexp=STARTTLS line=""
time=2026-09-09T05:44:31.466Z level=ERROR source=handler.go:130 msg="Probe failed" module=smtp_starttls target=mail.906.sh:25 duration_seconds=1.007876341



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 0.036455284
# HELP probe_duration_seconds Returns how long the probe took to complete in seconds
# TYPE probe_duration_seconds gauge
probe_duration_seconds 1.007876341
# 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 1
# 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 2.340274959e+09
# 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: EHLO blackbox.local\r\n
  - expect: STARTTLS
icmp:
  ip_protocol_fallback: true
  ttl: 64
dns:
  ip_protocol_fallback: true
  recursion_desired: true