1. A method comprising: an event tracking system receiving, from an external multi-tenant application platform system, first usage trigger configuration for a first platform account of the platform system; the event tracking system storing the first usage trigger configuration; the event tracking system receiving at least one event publication from the multi-tenant application platform system via an interface of the event tracking system; for each event publication received via the interface: the event tracking system determining whether the event publication is associated with the first usage trigger configuration, and responsive to a determination that the event publication is associated with the first usage trigger configuration, the event tracking system incrementing a first counter associated with the first usage trigger configuration; and responsive to a determination that the first counter satisfies a first trigger condition of the first usage trigger configuration, the event tracking system sending a request to one of the platform system and an external application server system of the first platform account, in accordance with a first trigger action of the first usage trigger configuration.