Computer resources in a computer network can be predictively monitored where those resources are conventionally monitored using a monitoring rule. For predictive monitoring, the current values of the parameters of the monitoring rule are tracked at regular intervals. The current values are used in an “inverted” or predictive form of the conventional monitoring rule to derive a predictive value that is indicative of the imminence of a defined event. The monitoring system may be instructed to report a predictive value that exceeds a predetermined percentage of the final value at which the resource event will be deemed to have occurred. The earlier report increases the chances the network manager will have sufficient time to take appropriate preemptive action to prevent actual occurrence of the event.