In member Task ScopedBackgroundService.StopAsync(CancellationToken stoppingToken), change parameter name stoppingToken to cancellationToken in order to match the identifier as it has been declared in Task BackgroundService.StopAsync(CancellationToken cancellationToken) (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1725)

Possible null reference argument for parameter 'source' in 'Tracker[] Enumerable.ToArray<Tracker>(IEnumerable<Tracker> source)'.

In member Task ScopedBackgroundService.StopAsync(CancellationToken stoppingToken), change parameter name stoppingToken to cancellationToken in order to match the identifier as it has been declared in Task BackgroundService.StopAsync(CancellationToken cancellationToken) (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1725)