Bits of .NET

Looks fine locally.
Stops running in prod.

Root cause
Unhandled exceptions inside ExecuteAsync.

What actually happens
The host kills the service quietly.

Correct pattern

protected override async Task ExecuteAsync(CancellationToken ct)
{
    while (!ct.IsCancellationRequested)
    {
        try
        {
            await DoWork(ct);
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Background task failed");
            await Task.Delay(5000, ct);
        }
    }
}

Cause → Effect
Unhandled exception → service stops → no alerts → ghost bugs.