The Istio mixer provides the foundation of the Istio service mesh design. It is responsible for insulating the Istio proxy and Istio-based services from details of the current execution environment, as well as to implement the control policies that Istio supports.
The Istio mixer provides three distinct features:
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Precondition Checking. Enables callers to verify a number of preconditions before responding to an incoming request from a service consumer. Preconditions can include whether the service consumer is properly authenticated, is on the service's whitelist, passes ACL checks, and more.
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Telemetry Reporting. Enables services to produce logging, monitoring, tracing and billing streams intended for the service producer itself as well as for its consumers.
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Quota Management. Enables services to allocate and free quota on a number of dimensions, Quotas are used as a relatively simple resource management tool to provide some fairness between service consumers when contending for limited resources.
Please see the main Istio README file to learn about the overall Istio project and how to get in touch with us. To learn how you can contribute to any of the Istio components, including the mixer, please see the Istio contribution guidelines.
The Istio mixer's developer's guide presents everything you need to know to create, build, and test code for the mixer.