Today, the Cloud Native Computing Foundation (CNCF) announced acceptance of Cortex, a multitenant Prometheus-as-a-Service, into the CNCF Sandbox, a home for early stage and evolving cloud native projects.

Developed to scale Prometheus in a multitenant fashion, Cortex provides long term storage for Prometheus metrics when used as a remote write destination, and a horizontally scalable, Prometheus-compatible query API.

Cortex was originally developed at Weaveworks in 2016, and is currently used in production by organizations like Grafana Labs, FreshTracks, and EA.

Cortex architecture

Cortex provides use cases both for service providers, who are managing large numbers of Prometheus instances and want to provide long term storage as a source of value, and for enterprises that want to centralize management of large scale Prometheus deployments and ensure long term durability of Prometheus data while providing a global query view.

“By joining CNCF, Cortex will have a neutral home for collaboration between contributor companies, while allowing the Prometheus ecosystem to grow a more robust set of integrations and solutions,” said Alexis Richardson, CEO of Weaveworks. “Cortex already has a strong affinity with several CNCF technologies, incuding Kubernetes, gRPC, OpenTracing and Jaeger, so it’s a natural fit for us to continue building on these interoperabilities as part of CNCF.”

TOC sponsors of the project are Bryan Cantrill and Ken Owens.

“At we believe in bringing the right data to the right people at the right time. Cortex is at the heart of our offering providing multi-cluster cluster and multi-cloud visibility to developers and operators. Cortex’s entry into CNCF is exciting, as it will provide the visibility and governance needed to ensure the ecosystem continues healthy growth,” says Bob Cotton, co-founder of

The CNCF Sandbox is a home for early stage projects, for further clarification around project maturity levels in CNCF, please visit our outlined Graduation Criteria.