Logs for the probe:
time=2026-08-26T08:43:04.863Z level=WARN source=http.go:490 msg="Received redirect" module=http_cppalliance_org_slack target=http://slack-invite.cpp.al location=https://cppalliance.org/slack/
time=2026-08-26T08:43:04.988Z level=ERROR source=http.go:605 msg="Invalid HTTP response status code, wanted 2xx" module=http_cppalliance_org_slack target=http://slack-invite.cpp.al status_code=503
time=2026-08-26T08:43:04.993Z level=ERROR source=handler.go:130 msg="Probe failed" module=http_cppalliance_org_slack target=http://slack-invite.cpp.al duration_seconds=0.204887421



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 0.023188539
# HELP probe_duration_seconds Returns how long the probe took to complete in seconds
# TYPE probe_duration_seconds gauge
probe_duration_seconds 0.204887421
# 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_http_content_length Length of http content response
# TYPE probe_http_content_length gauge
probe_http_content_length -1
# HELP probe_http_duration_seconds Duration of http request by phase, summed over all redirects
# TYPE probe_http_duration_seconds gauge
probe_http_duration_seconds{phase="connect"} 0.044973381
probe_http_duration_seconds{phase="processing"} 0.103239627
probe_http_duration_seconds{phase="resolve"} 0.024434801000000003
probe_http_duration_seconds{phase="tls"} 0.025895793
probe_http_duration_seconds{phase="transfer"} 0.005084522
# HELP probe_http_redirects The number of redirects
# TYPE probe_http_redirects gauge
probe_http_redirects 1
# HELP probe_http_ssl Indicates if SSL was used for the final redirect
# TYPE probe_http_ssl gauge
probe_http_ssl 1
# HELP probe_http_status_code Response HTTP status code
# TYPE probe_http_status_code gauge
probe_http_status_code 503
# HELP probe_http_uncompressed_body_length Length of uncompressed response body
# TYPE probe_http_uncompressed_body_length gauge
probe_http_uncompressed_body_length 55246
# HELP probe_http_version Returns the version of HTTP of the probe response
# TYPE probe_http_version gauge
probe_http_version 2
# 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 2.518197584e+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_ssl_earliest_cert_expiry Returns last SSL chain expiry in unixtime
# TYPE probe_ssl_earliest_cert_expiry gauge
probe_ssl_earliest_cert_expiry 1.793560226e+09
# HELP probe_ssl_last_chain_expiry_timestamp_seconds Returns last SSL chain expiry in timestamp
# TYPE probe_ssl_last_chain_expiry_timestamp_seconds gauge
probe_ssl_last_chain_expiry_timestamp_seconds 1.793560226e+09
# HELP probe_ssl_last_chain_info Contains SSL leaf certificate information
# TYPE probe_ssl_last_chain_info gauge
probe_ssl_last_chain_info{fingerprint_sha256="3e405df4318cd5e1ab8a414d9b60023fa0b6b0d0b1950f3f8597f753feba360b",issuer="CN=WE1,O=Google Trust Services,C=US",serialnumber="ee46b372a1cc0cd1134b851683679450",subject="CN=cppalliance.org",subjectalternative="cppalliance.org,*.cppalliance.org"} 1
# HELP probe_success Displays whether or not the probe was a success
# TYPE probe_success gauge
probe_success 0
# HELP probe_tls_cipher_info Returns the TLS cipher negotiated during handshake
# TYPE probe_tls_cipher_info gauge
probe_tls_cipher_info{cipher="TLS_AES_128_GCM_SHA256"} 1
# HELP probe_tls_version_info Returns the TLS version used or NaN when unknown
# TYPE probe_tls_version_info gauge
probe_tls_version_info{version="TLS 1.3"} 1



Module configuration:
prober: http
http:
  preferred_ip_protocol: ip4
  ip_protocol_fallback: true
  fail_if_body_not_matches_regexp:
  - This is a multi-channel Slack workspace environment which gathers users of C\+\+
  follow_redirects: true
  enable_http2: true
tcp:
  ip_protocol_fallback: true
icmp:
  ip_protocol_fallback: true
  ttl: 64
dns:
  ip_protocol_fallback: true
  recursion_desired: true