Merging multiple unsynchronized streams of related events and multi-tenant support

A computing system to implement a method for handling asynchronous event streams in a multi-tenant system, the computing system comprising:

• a non-transitory machine-readable storage medium having stored therein a rules engine;
• and
• a processor coupled to the non-transitory machine-readable storage medium, the processor to execute the rules engine, the rules engine to receive at least a first stream of events and a second stream of events, to determine by pattern matching of the rules engine, whether data in events of the first stream or data in events of the second stream meet conditions of a rule defined by a tenant of the multi-tenant system, and to implement the rule including a set of actions to modify data from events of the second stream, in response to the data in the events of first stream matching the conditions of the rule.