Unexpected frontend outage

[FrostyX]

Copr frontend returned 503 error page and every request sent messages like this to /var/log/httpd/error_log:

[Sat Feb 22 10:47:20.021513 2025] [wsgi:error] [pid 1197677:tid 1197722] (11)Resource temporarily unavailable: [client 77.218.50.147:58748] mod_wsgi (pid=1197677): Unable to connect to WSGI daemon process '127.0.0.1' on '/var/run/wsgi.3778384.3.1.sock' after multiple attempts as listener backlog limit was exceeded or the socket does not exist., referer: https://copr.fedorainfracloud.org/coprs/ublue-os/
[Sat Feb 22 10:47:20.032605 2025] [wsgi:error] [pid 1197618:tid 1197659] (11)Resource temporarily unavailable: [client 70.68.38.15:54231] mod_wsgi (pid=1197618): Unable to connect to WSGI daemon process '127.0.0.1' on '/var/run/wsgi.3778384.3.1.sock' after multiple attempts as listener backlog limit was exceeded or the socket does not exist., referer: https://copr.fedorainfracloud.org/coprs/bishopolis/misc/builds/
[Sat Feb 22 10:47:23.033428 2025] [wsgi:error] [pid 526348:tid 526387] [client 40.77.167.27:52418] Timeout when reading response headers from daemon process '127.0.0.1': /usr/share/copr/coprs_frontend/application
[Sat Feb 22 10:47:23.159696 2025] [wsgi:error] [pid 526348:tid 526381] [client 3.15.177.45:63238] Timeout when reading response headers from daemon process '127.0.0.1': /usr/share/copr/coprs_frontend/application
[Sat Feb 22 10:47:23.302442 2025] [wsgi:error] [pid 526348:tid 526391] [client 3.138.102.219:42667] Timeout when reading response headers from daemon process '127.0.0.1': /usr/share/copr/coprs_frontend/application

The outage started with this line and fortunately lasted only 10 minutes.

[Sat Feb 22 10:41:52.194472 2025] [wsgi:error] [pid 643325:tid 643363] (11)Resource temporarily unavailable: [client 18.226.94.242:39831] mod_wsgi (pid=643325): Unable to connect to WSGI daemon process '127.0.0.1' on '/var/run/wsgi.3778384.3.1.sock' after multiple attempts as listener backlog limit was exceeded or the socket does not exist.

Solved by restarting httpd.

[FrostyX]

This doesn't look like the dnf-automatic situation. The last update was yesterday.

[root@copr-fe ~][PROD]# dnf history list
ID Command line                                  Date and time       Action(s) Altered
27 /usr/bin/dnf5 automatic --timer               2025-02-21 06:21:09                12