1. A computer implemented method of managing capacity in a service-provider system in a forecast-less manner, the computer implemented method comprising: creating a software model of a physical service-provider system; a processor storing the software model in memory; establishing a parameter for running the software model with real-time metrics from the physical service-provider system as inputs to the software model; in response to the parameter being met, running the software model using the real-time metrics from the physical service-provider system as inputs; establishing a pre-determined action that is prescribed by a specific model output, wherein the pre-determined action adjusts capacity in the service-provider system; and in response to the specific model output being output from the software model, executing the pre-determined action.