Application Startup Log Validation

Catching log write failures at startup treats an inability to log as the installation or configuration error that it is, rather than allowing it to silently corrupt operational visibility. An application that silently continues operating while unable to log its errors is running blind; when a real failure occurs later, there will be no record of it. If the error log cannot be written at startup, the application should refuse to start and display a clear, descriptive message explaining why. Testing whether the application can write to its error log must happen at startup, before the application is allowed to function.