Probe failed due to TLS issue...it is not the same issue with my mail 
server..
There is no "i/o timeout" issue for google's mail server.

curl -g '
http://0.0.0.0:9115/probe?module=smtp_starttls&target=142.250.102.27:25&debug=true
 
<http://100.100.3.9:9115/probe?module=smtp_starttls&target=142.250.102.27:25&debug=true>
'
Logs for the probe:
ts=2022-07-05T02:04:33.373763474Z caller=main.go:320 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Beginning probe" probe=tcp 
timeout_seconds=5
ts=2022-07-05T02:04:33.373850167Z caller=tcp.go:40 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Resolving target address" 
ip_protocol=ip6
ts=2022-07-05T02:04:33.373867876Z caller=tcp.go:40 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Resolving target address" 
ip_protocol=ip4
ts=2022-07-05T02:04:33.373882263Z caller=tcp.go:40 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Resolved target address" 
ip=142.250.102.27
ts=2022-07-05T02:04:33.373903614Z caller=tcp.go:121 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Dialing TCP without TLS"
ts=2022-07-05T02:04:33.385587664Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Successfully dialed"
ts=2022-07-05T02:04:33.385613189Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Processing query response entry" 
entry_number=0
ts=2022-07-05T02:04:33.419235886Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line="220 mx.google.com 
ESMTP 
dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
ts=2022-07-05T02:04:33.419280493Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Regexp matched" regexp="^220 ([^ 
]+) ESMTP (.+)$" line="220 mx.google.com ESMTP 
dn22-20020a17090794d600b006dfc3945326si6666807ejc.152 - gsmtp"
ts=2022-07-05T02:04:33.419310506Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Sending line" line="EHLO prober"
ts=2022-07-05T02:04:33.419356415Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Processing query response entry" 
entry_number=1
ts=2022-07-05T02:04:33.43519464Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line="250-mx.google.com at 
your service, [130.214.226.41]"
ts=2022-07-05T02:04:33.435229899Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line="250-SIZE 
157286400"
ts=2022-07-05T02:04:33.435242182Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line=250-8BITMIME
ts=2022-07-05T02:04:33.435254457Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line=250-STARTTLS
ts=2022-07-05T02:04:33.435270364Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Regexp matched" 
regexp=^250-STARTTLS line=250-STARTTLS
ts=2022-07-05T02:04:33.435285968Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Processing query response entry" 
entry_number=2
ts=2022-07-05T02:04:33.435310813Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" 
line=250-ENHANCEDSTATUSCODES
ts=2022-07-05T02:04:33.435323258Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line=250-PIPELINING
ts=2022-07-05T02:04:33.435337373Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line=250-CHUNKING
ts=2022-07-05T02:04:33.435373931Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line="250 SMTPUTF8"
ts=2022-07-05T02:04:33.435392537Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Regexp matched" regexp="^250 .*$" 
line="250 SMTPUTF8"
ts=2022-07-05T02:04:33.435409638Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Sending line" line=STARTTLS
ts=2022-07-05T02:04:33.435451742Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Processing query response entry" 
entry_number=3
ts=2022-07-05T02:04:33.449015201Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=debug msg="Read line" line="220 2.0.0 Ready 
to start TLS"
ts=2022-07-05T02:04:33.449039996Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=info msg="Regexp matched" regexp=^220 
line="220 2.0.0 Ready to start TLS"
ts=2022-07-05T02:04:33.476697731Z caller=main.go:130 module=smtp_starttls 
target=142.250.102.27:25 level=error msg="TLS Handshake (client) failed" 
err="x509: cannot validate certificate for 142.250.102.27 because it 
doesn't contain any IP SANs"
ts=2022-07-05T02:04:33.47676603Z caller=main.go:320 module=smtp_starttls 
target=142.250.102.27:25 level=error msg="Probe failed" 
duration_seconds=0.102953678




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 5.1452e-05

# HELP probe_duration_seconds Returns how long the probe took to complete 
in seconds
# TYPE probe_duration_seconds gauge
probe_duration_seconds 0.102953678

# 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 9.60720384e+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: 5s
http:
    ip_protocol_fallback: true
    follow_redirects: true
tcp:
    ip_protocol_fallback: true
    query_response:
        - expect: ^220 ([^ ]+) ESMTP (.+)$
          send: EHLO prober
        - expect: ^250-STARTTLS
        - expect: ^250 .*$
          send: STARTTLS
        - expect: ^220
          starttls: true
        - send: EHLO prober
        - expect: ^250 .*$
          send: QUIT
icmp:
    ip_protocol_fallback: true
dns:
    ip_protocol_fallback: true


On Monday, July 4, 2022 at 8:44:49 PM UTC+8 Brian Candler wrote:

> And if you try it with Google's mail server?
> *curl -g 
> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>
> On Monday, 4 July 2022 at 12:50:47 UTC+1 [email protected] wrote:
>
>> Still received the same error msg:
>>
>> curl -g '
>> http://0.0.0.0:9115/probe?module=smtp_starttls&target=1.1.1.1:25&debug=true
>> '
>> Logs for the probe:
>> ts=2022-07-04T11:47:59.071097704Z caller=main.go:320 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=info msg="Beginning probe" probe=tcp 
>> timeout_seconds=5
>> ts=2022-07-04T11:47:59.071251831Z caller=tcp.go:40 module=smtp_starttls 
>> target=1 1.1.1.1  :25 level=info msg="Resolving target address" 
>> ip_protocol=ip6
>> ts=2022-07-04T11:47:59.071292289Z caller=tcp.go:40 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=info msg="Resolving target address" 
>> ip_protocol=ip4
>> ts=2022-07-04T11:47:59.071327224Z caller=tcp.go:40 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=info msg="Resolved target address" ip= 1.1.1.1
>> ts=2022-07-04T11:47:59.071354819Z caller=tcp.go:121 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=info msg="Dialing TCP without TLS"
>> ts=2022-07-04T11:47:59.072469713Z caller=main.go:130 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=info msg="Successfully dialed"
>> ts=2022-07-04T11:47:59.072508076Z caller=main.go:130 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=info msg="Processing query response entry" 
>> entry_number=0
>> ts=2022-07-04T11:47:59.073453639Z caller=main.go:130 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=debug msg="Read line" line="220  ESMTP"
>> ts=2022-07-04T11:48:04.072081695Z caller=main.go:130 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=error msg="Error reading from connection" 
>> err="read tcp4 0.0.0.0:53872->1.1.1.1:25: i/o timeout"
>> ts=2022-07-04T11:48:04.072269643Z caller=main.go:320 module=smtp_starttls 
>> target= 1.1.1.1  :25 level=error msg="Probe failed" 
>> duration_seconds=5.00106792
>>
>>
>>
>> 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 0.000101683
>> # HELP probe_duration_seconds Returns how long the probe took to complete 
>> in seconds
>> # TYPE probe_duration_seconds gauge
>> probe_duration_seconds 5.00106792
>> # 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 2.493392506e+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: 5s
>> http:
>>     ip_protocol_fallback: true
>>     follow_redirects: true
>> tcp:
>>     ip_protocol_fallback: true
>>     query_response:
>>         - expect: ^220 ([^ ]+) ESMTP (.+)$
>>           send: EHLO prober
>>         - expect: ^250-STARTTLS
>>         - expect: ^250 .*$
>>           send: STARTTLS
>>         - expect: ^220
>>           starttls: true
>>         - send: EHLO prober
>>         - expect: ^250 .*$
>>           send: QUIT
>> icmp:
>>     ip_protocol_fallback: true
>> dns:
>>     ip_protocol_fallback: true
>>
>> On Monday, July 4, 2022 at 7:22:08 PM UTC+8 Brian Candler wrote:
>>
>>> Could you first just try copy-pasting the working config I gave you, and 
>>> see if it gives a different result to yours?
>>>
>>> I doubt a mail server would take more than 5 seconds to give a banner, 
>>> but it's possible.  Simply doing "telnet x.x.x.x 25" will show you how your 
>>> mail server behaves.
>>>
>>> On Monday, 4 July 2022 at 11:14:23 UTC+1 [email protected] wrote:
>>>
>>>>
>>>> Yes in my code the first expect is quoted.
>>>>
>>>> smtp_starttls:
>>>>         prober: tcp
>>>>         timeout: 5s
>>>>         tcp:
>>>>           query_response:
>>>>             - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>>             - send: "EHLO prober\r"
>>>>             - expect: "^250-STARTTLS"
>>>>             - send: "STARTTLS\r"
>>>>             - expect: "^220"
>>>>             - starttls: true
>>>>             - send: "EHLO prober\r"
>>>>             - expect: "^250-AUTH"
>>>>             - send: "QUIT\r"
>>>>
>>>> Probably due to the "timeout" is too less? Should I adjust 5s to 15s or 
>>>> 60s?
>>>> On Monday, July 4, 2022 at 5:55:09 PM UTC+8 Brian Candler wrote:
>>>>
>>>>> The following works for me with blackbox_exporter 0.21.0 (maybe your 
>>>>> first 'expect' regexp needs to be quoted?)
>>>>>
>>>>> modules:
>>>>>   smtp_starttls:
>>>>>       prober: tcp
>>>>>       timeout: 5s
>>>>>       tcp:
>>>>>         query_response:
>>>>>           - expect: "^220 ([^ ]+) ESMTP (.+)$"
>>>>>             send: "EHLO prober"
>>>>>           - expect: "^250-STARTTLS"
>>>>>           - expect: "^250 .*$"
>>>>>             send: "STARTTLS"
>>>>>           - expect: "^220"
>>>>>
>>>>>             starttls: true
>>>>>           - send: "EHLO prober"
>>>>>           - expect: "^250 .*$"
>>>>>             send: "QUIT"
>>>>>
>>>>> Result:
>>>>>
>>>>> # *curl -g 
>>>>> 'localhost:9115/probe?module=smtp_starttls&target=aspmx.l.google.com:25&debug=true'*
>>>>> Logs for the probe:
>>>>> ts=2022-07-04T09:50:46.764604425Z caller=main.go:351 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Beginning probe" probe=tcp timeout_seconds=5
>>>>> ts=2022-07-04T09:50:46.764875668Z caller=tcp.go:40 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Resolving target address" target=aspmx.l.google.com 
>>>>> ip_protocol=ip6
>>>>> ts=2022-07-04T09:50:46.765954096Z caller=tcp.go:40 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Resolved target address" target=aspmx.l.google.com 
>>>>> ip=2a00:1450:400c:c07::1b
>>>>> ts=2022-07-04T09:50:46.766011111Z caller=tcp.go:121 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Dialing TCP without TLS"
>>>>> ts=2022-07-04T09:50:46.776962616Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Successfully dialed"
>>>>> ts=2022-07-04T09:50:46.77708032Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Processing query response entry" entry_number=0
>>>>> ts=2022-07-04T09:50:46.788075017Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="220 mx.google.com ESMTP 
>>>>> u1-20020a056000038100b0021bbcef3a69si36572085wrf.542 - gsmtp"
>>>>> ts=2022-07-04T09:50:46.788168204Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Regexp matched" regexp="^220 ([^ ]+) ESMTP (.+)$" line="220 
>>>>> mx.google.com ESMTP 
>>>>> u1-20020a056000038100b0021bbcef3a69si36572085wrf.542 - gsmtp"
>>>>> ts=2022-07-04T09:50:46.788223914Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Sending line" line="EHLO prober"
>>>>> ts=2022-07-04T09:50:46.788362926Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Processing query response entry" entry_number=1
>>>>> ts=2022-07-04T09:50:46.801755535Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="250-mx.google.com at your service, 
>>>>> [xx:xx:xx:xx::33]"
>>>>> ts=2022-07-04T09:50:46.801856147Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="250-SIZE 157286400"
>>>>> ts=2022-07-04T09:50:46.801889927Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-8BITMIME
>>>>> ts=2022-07-04T09:50:46.801922312Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-STARTTLS
>>>>> ts=2022-07-04T09:50:46.801955499Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Regexp matched" regexp=^250-STARTTLS line=250-STARTTLS
>>>>> ts=2022-07-04T09:50:46.801989646Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Processing query response entry" entry_number=2
>>>>> ts=2022-07-04T09:50:46.802029066Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-ENHANCEDSTATUSCODES
>>>>> ts=2022-07-04T09:50:46.802063318Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-PIPELINING
>>>>> ts=2022-07-04T09:50:46.802094713Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-CHUNKING
>>>>> ts=2022-07-04T09:50:46.802126198Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="250 SMTPUTF8"
>>>>> ts=2022-07-04T09:50:46.802159858Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>> ts=2022-07-04T09:50:46.802191065Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Sending line" line=STARTTLS
>>>>> ts=2022-07-04T09:50:46.802271697Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Processing query response entry" entry_number=3
>>>>> ts=2022-07-04T09:50:46.812211682Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="220 2.0.0 Ready to start TLS"
>>>>> ts=2022-07-04T09:50:46.812279339Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Regexp matched" regexp=^220 line="220 2.0.0 Ready to start TLS"
>>>>> ts=2022-07-04T09:50:46.833573801Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info msg="TLS 
>>>>> Handshake (client) succeeded."
>>>>> ts=2022-07-04T09:50:46.833793385Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Processing query response entry" entry_number=4
>>>>> ts=2022-07-04T09:50:46.833838422Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Sending line" line="EHLO prober"
>>>>> ts=2022-07-04T09:50:46.833960852Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Processing query response entry" entry_number=5
>>>>> ts=2022-07-04T09:50:46.84464181Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="250-mx.google.com at your service, 
>>>>> [xx:xx:xx:xx::33]"
>>>>> ts=2022-07-04T09:50:46.844771942Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="250-SIZE 157286400"
>>>>> ts=2022-07-04T09:50:46.844839074Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-8BITMIME
>>>>> ts=2022-07-04T09:50:46.844910271Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-ENHANCEDSTATUSCODES
>>>>> ts=2022-07-04T09:50:46.844974538Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-PIPELINING
>>>>> ts=2022-07-04T09:50:46.845061058Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line=250-CHUNKING
>>>>> ts=2022-07-04T09:50:46.84512579Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Read line" line="250 SMTPUTF8"
>>>>> ts=2022-07-04T09:50:46.845193403Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Regexp matched" regexp="^250 .*$" line="250 SMTPUTF8"
>>>>> ts=2022-07-04T09:50:46.84525809Z caller=main.go:144 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=debug 
>>>>> msg="Sending line" line=QUIT
>>>>> ts=2022-07-04T09:50:46.845583228Z caller=main.go:351 
>>>>> module=smtp_starttls target=aspmx.l.google.com:25 level=info 
>>>>> msg="Probe succeeded" duration_seconds=0.080912196
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> 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 0.001103057
>>>>>
>>>>> # HELP probe_duration_seconds Returns how long the probe took to 
>>>>> complete in seconds
>>>>> # TYPE probe_duration_seconds gauge
>>>>> probe_duration_seconds 0.080912196
>>>>>
>>>>> # 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 2.766777767e+09
>>>>>
>>>>> # HELP probe_ip_protocol Specifies whether probe ip protocol is IP4 or 
>>>>> IP6
>>>>> # TYPE probe_ip_protocol gauge
>>>>> probe_ip_protocol 6
>>>>> # HELP probe_ssl_earliest_cert_expiry Returns earliest SSL cert expiry 
>>>>> date
>>>>> # TYPE probe_ssl_earliest_cert_expiry gauge
>>>>> probe_ssl_earliest_cert_expiry 1.661764429e+09
>>>>> # HELP probe_ssl_last_chain_expiry_timestamp_seconds Returns last SSL 
>>>>> chain expiry in unixtime
>>>>> # TYPE probe_ssl_last_chain_expiry_timestamp_seconds gauge
>>>>> probe_ssl_last_chain_expiry_timestamp_seconds 1.661764429e+09
>>>>>
>>>>> # HELP probe_success Displays whether or not the probe was a success
>>>>> # TYPE probe_success gauge
>>>>> probe_success 1
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Module configuration:
>>>>> prober: tcp
>>>>> timeout: 5s
>>>>> http:
>>>>>     ip_protocol_fallback: true
>>>>>     follow_redirects: true
>>>>>     enable_http2: true
>>>>>
>>>>> tcp:
>>>>>     ip_protocol_fallback: true
>>>>>     query_response:
>>>>>         - expect: ^220 ([^ ]+) ESMTP (.+)$
>>>>>           send: EHLO prober
>>>>>         - expect: ^250-STARTTLS
>>>>>         - expect: ^250 .*$
>>>>>           send: STARTTLS
>>>>>         - expect: ^220
>>>>>
>>>>>           starttls: true
>>>>>         - send: EHLO prober
>>>>>         - expect: ^250 .*$
>>>>>           send: QUIT
>>>>>
>>>>> icmp:
>>>>>     ip_protocol_fallback: true
>>>>> dns:
>>>>>     ip_protocol_fallback: true
>>>>>     recursion_desired: true
>>>>>
>>>>

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