It is running on a basic hosting service I use for a long time now (umbler.com).
The latest error message in the log file (and the only one that seems relevant) is this:
{"reqId":"Y7R9ruM2INkLyT6ny0uCNQAHktc","level":3,"time":"2023-01-03T19:10:38+00:00","remoteAddr":"187.106.251.242","user":"admin","app":"index","method":"GET","url":"/nextcloud/index.php/settings/admin/serverinfo","message":"Call to undefined function OCA\\ServerInfo\\OperatingSystems\\shell_exec() in file '/home/mais.mat.br/public/nextcloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php' line 248","userAgent":"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:108.0) Gecko/20100101 Firefox/108.0","version":"25.0.2.3","exception":{"Exception":"Exception","Message":"Call to undefined function OCA\\ServerInfo\\OperatingSystems\\shell_exec() in file '/home/mais.mat.br/public/nextcloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php' line 248","Code":0,"Trace":[{"file":"/home/mais.mat.br/public/nextcloud/lib/private/AppFramework/App.php","line":172,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/lib/private/Route/Router.php","line":298,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/home/mais.mat.br/public/nextcloud/lib/base.php","line":1047,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/home/mais.mat.br/public/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","Line":165,"Previous":{"Exception":"Error","Message":"Call to undefined function OCA\\ServerInfo\\OperatingSystems\\shell_exec()","Code":0,"Trace":[{"file":"/home/mais.mat.br/public/nextcloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php","line":186,"function":"executeCommand","class":"OCA\\ServerInfo\\OperatingSystems\\DefaultOs","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/apps/serverinfo/lib/Os.php","line":78,"function":"getDiskInfo","class":"OCA\\ServerInfo\\OperatingSystems\\DefaultOs","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/apps/serverinfo/lib/Settings/AdminSettings.php","line":79,"function":"getDiskInfo","class":"OCA\\ServerInfo\\Os","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/apps/settings/lib/Controller/CommonSettingsTrait.php","line":129,"function":"getForm","class":"OCA\\ServerInfo\\Settings\\AdminSettings","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/apps/settings/lib/Controller/AdminSettingsController.php","line":83,"function":"formatSettings","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/apps/settings/lib/Controller/CommonSettingsTrait.php","line":149,"function":"getSettings","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/apps/settings/lib/Controller/AdminSettingsController.php","line":68,"function":"getIndexResponse","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":225,"function":"index","class":"OCA\\Settings\\Controller\\AdminSettingsController","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/lib/private/AppFramework/Http/Dispatcher.php","line":133,"function":"executeController","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/lib/private/AppFramework/App.php","line":172,"function":"dispatch","class":"OC\\AppFramework\\Http\\Dispatcher","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/lib/private/Route/Router.php","line":298,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/home/mais.mat.br/public/nextcloud/lib/base.php","line":1047,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/home/mais.mat.br/public/nextcloud/index.php","line":36,"function":"handleRequest","class":"OC","type":"::"}],"File":"/home/mais.mat.br/public/nextcloud/apps/serverinfo/lib/OperatingSystems/DefaultOs.php","Line":248},"CustomMessage":"--"},"id":"63b49b18be4ac"}