A method may include defining a rule identifying an event that triggers a change in a value of a metric. The defining of the rule includes generating a subscription to receive the event from an event stream. Occurrences of the event identified by the rule may be detected based on receiving the event from the event stream. In response to each occurrence of the event, the value of the metric and/or the change in the value of the metric may be evaluated. A notification may be sent to a software application consuming the metric based on the value of the metric and/or the change in the value of the metric satisfying a threshold. Related systems and computer program products are also provided.