EnvironmentsController.cs

    public class EnvironmentsController : OctopusController
    {
        readonly IDataContext dataContext;

        public EnvironmentsController(IDataContext dataContext)
        {
            this.dataContext = dataContext;
        }

        public ActionResult Index()
        {
            var environments = dataContext.Set<DeploymentEnvironment>()
                .Include(m => m.Machines)
                .Include(m => m.Variables)
                .OrderBy(m => m.SortOrder)
                .ToList();

            var upgradeNeeded = environments.SelectMany(m => m.Machines).Any(x => x.NeedsUpgrading ?? false);
            if (upgradeNeeded)
            {
                ViewData.FlashWarning("One or more of your machines below appear to be running old versions of Octopus Tentacle. Please use the \"Upgrade All\" button above to upgrade them. Or, use the \"Check Health\" button to refresh the version numbers.");
            }

            return View(new EnvironmentListModel(environments));
        }