16. A method for proactive management of performance of an application, the method comprising: monitoring, by a digital data processor, (i) usage of the application by a user and/or one or more components thereof by the user, and (ii) consumption of the one or more resources during usage of the application and/or one or more components thereof by the user, wherein the resources include any of processing capacity, memory capacity, and/or network bandwidth, and signaling an alert upon determining that such usage by the user and/or consumption of resources during such usage violates a model, wherein the model defines one or more quotas for the user with respect to usage of a component of the application by the user, wherein the one or more quotas defined by the model include a maximum resource consumption quota and an expected resource consumption quota, wherein the model indicates that the user is permitted to consume no more than a pre-determined amount of processor capacity and no more than a pre-determined amount of network bandwidth, and wherein the maximum resource consumption quota is between 0.1-0.6 percent peak of the processor capacity to be consumed by the user, and between 10-200 kilobytes per second peak on the network to be consumed by the user during use of the application.
19. The method of claim 16 , wherein the quotas include any of (i) maximum permitted usage of the application by users in each of one or more classes, and (ii) expected usage of the application by users in each of one or more classes.