TLS handshakes counter error

[const-t]

It seems there is an error in handshakes counter logic, I do only one request, Tempesta receives only one request, but incremented "successful" and "fail" counters, however expected to be incremented only "successful" counter.

cat /proc/tempesta/perfstat output:

Minimal response time		: 0ms
Average response time		: 0ms
Median  response time		: 0ms
Maximum response time		: 0ms
Percentiles
50%:	0ms
75%:	0ms
90%:	0ms
95%:	0ms
99%:	0ms
SS work queue full			: 0
SS work queues' sizes			: 0 0 0 0 0 0
SS backlog's sizes			: 0 0 0 0 0 0
Cache hits				: 0
Cache misses				: 1
Client messages received		: 1
Client messages forwarded		: 1
Client messages served from cache	: 0
Client messages parsing errors		: 0
Client messages filtered out		: 0
Client messages other errors		: 0
Clients online				: 0
Client connection attempts		: 1
Client established connections		: 1
Client connections active		: 0
Client RX bytes				: 29
Server messages received		: 1
Server messages forwarded		: 1
Server messages parsing errors		: 0
Server messages filtered out		: 0
Server messages other errors		: 0
Server connection attempts		: 128
Server established connections		: 128
Server connections active		: 128
Server connections schedulable		: 128
Server RX bytes				: 959
Server successful TLS handshakes	: 1
Server failed TLS handshakes		: 1 <-- ERROR: Why we have failed?

curl -vk https://ubuntu output:

*   Trying 127.0.0.1:443...
* Connected to ubuntu (127.0.0.1) port 443 (#0)
* ALPN: offers h2
* ALPN: offers http/1.1
* TLSv1.0 (OUT), TLS header, Certificate Status (22):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS header, Finished (20):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS header, Finished (20):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-ECDSA-AES128-GCM-SHA256
* ALPN: server accepted h2
* Server certificate:
*  subject: C=US; ST=Washington; L=Seattle; O=Tempesta Technologies Inc.; OU=Testing; CN=tempesta-tech.com; [email protected]
*  start date: Sep 10 14:15:59 2023 GMT
*  expire date: Sep 10 14:15:59 2024 GMT
*  issuer: C=US; ST=Washington; L=Seattle; O=Tempesta Technologies Inc.; OU=Testing; CN=tempesta-tech.com; [email protected]
*  SSL certificate verify result: self-signed certificate (18), continuing anyway.
* Using HTTP2, server supports multiplexing
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* h2h3 [:method: GET]
* h2h3 [:path: /]
* h2h3 [:scheme: https]
* h2h3 [:authority: ubuntu]
* h2h3 [user-agent: curl/7.85.0-DEV]
* h2h3 [accept: */*]
* Using Stream ID: 1 (easy handle 0x5594c8802160)
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
> GET / HTTP/2
> Host: ubuntu
> user-agent: curl/7.85.0-DEV
> accept: */*