How and Why We Rebuilt Auto-scaling in OpenFaaS with Prometheus - Alex Ellis, OpenFaaS Ltd

In the Six Million Dollar Man we get the quote “We can rebuild him. We have the technology. We can make him better than he was. Better, stronger, faster.” And with that in mind, prompted by customer feedback we rebuilt the subsystem responsible for scaling OpenFaaS functions. The new and improved version serves the needs of customers better - with the added ability to scale on in-flight requests and CPU (as well as RPS). This wasn’t an easy journey and we think you’ll be able to learn from some of the PromQL we wrote, how we (instrument) collect the data and the issues we ran into along the way. There’ll be PromQL samples, live demos of scaling functions linked back to end-user use-cases.

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