CDriveHasGbFreeHealthCheck.cs

public class CDriveHasMoreThan1GbFreeHealthCheck : IHealthCheck
{
    public ValueTask<IHealthCheckResult> CheckAsync(CancellationToken cancellationToken = default(CancellationToken))
    {
        long freeSpaceinGb = GetTotalFreeSpaceInGb(@"C:\");
        CheckStatus status = freeSpaceinGb > 1 ? CheckStatus.Healthy : CheckStatus.Unhealthy;

        return new ValueTask<IHealthCheckResult>(HealthCheckResult.FromStatus(status, $"Free Space in GB: {freeSpaceinGb}"));

    }

    private long GetTotalFreeSpaceInGb(string driveName)
    {
        foreach (DriveInfo drive in DriveInfo.GetDrives())
        {
            if (drive.IsReady && drive.Name == driveName)
            {
                return drive.TotalFreeSpace / 1024 / 1024 / 1024;
            }
        }
        throw new ArgumentException($"Invalid Drive Name {driveName}");
    }
}