SPWebApplication.AlertsLimited property
SharePoint 2013
Gets or sets a value specifying whether there is a limit to the number of lists and list items for which a user can create alerts.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Property value
Type: System.BooleanIf true, the number of alerts contained in the AlertsMaximum property is used as a limit; otherwise, false. The default value is true.