Development and testing of the OpenStack project operates at a tremendous scale, with hundreds of code repositories and thousands of contributors interacting continuously. The infrastructure to support this has to operate at an equally large scale to ensure that it is not outpaced by the volume of upstream development activity.

Accordingly, enabling users and other consumers to see what is happening in realtime in this increasingly complex infrastructure becomes equally complex and large. This is why we need interfaces available to develop tooling to handle this. During Newton we introduced firehose.openstack.org to provide a unified message bus. Built using MQTT and Mosquitto, firehose is an interface where Infra's services can publish events.

This talk will cover the origin and background behind the firehose, how it's constructed and used by Infra, and also explain the benefits to the wider community and how they can use it for their own needs, experimentation and innovation.

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