Ah, danke, jetzt weiß ich auch was der effizienteste Weg zu den logs ist.
PHP message: # Instance=default, User=, Request=GET https://example.com/egroupware/login.php?phpgw_forward=%252Findex.php, User-agent=Blackbox Exporter/0.24.0" while reading response header from upstream, client: 172.18.0.1, server: _, request: "GET /egroupware/login.php?phpgw_forward=%252Findex.php HTTP/1.1", upstream: "fastcgi://172.18.0.5:9000", host: "example.com", referrer: "https://example.com/egroupware/index.php"
2023/07/27 07:57:50 [error] 21#21: *231 FastCGI sent in stderr: "
PHP message: An error happened (Error): Class "EGroupware\Api\Auth\" not found (0)
PHP message: File: /api/src/Auth.php, Line: 116
PHP message: #0 /usr/share/egroupware/api/src/Auth/Fallback.php(47): EGroupware\Api\Auth::backend()
PHP message: #1 /usr/share/egroupware/api/src/Auth/Fallbackmail2sql.php(27): EGroupware\Api\Auth\Fallback->__construct()
PHP message: #2 /usr/share/egroupware/api/src/Auth.php(116): EGroupware\Api\Auth\Fallbackmail2sql->__construct()
PHP message: #3 /usr/share/egroupware/api/src/Auth.php(178): EGroupware\Api\Auth::backend()
PHP message: #4 /usr/share/egroupware/login.php(75): EGroupware\Api\Auth::login()
PHP message: #5 {main}