Crate kube_runtime

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Common components for building Kubernetes operators

This crate contains the core building blocks to allow users to build controllers/operators/watchers that need to synchronize/reconcile kubernetes state.

Newcomers are recommended to start with the Controller builder, which gives an opinionated starting point that should be appropriate for simple operators, but all components are designed to be usable á la carte if your operator doesn’t quite fit that mold.



  • Runs a user-supplied reconciler function on objects when they (or related objects) are updated
  • Publishes events for objects for kubernetes >= 1.19
  • Finalizer helper for Controller reconcilers
  • Caches objects in memory
  • Delays and deduplicates [Stream] items
  • Helpers for manipulating built-in streams
  • Waits for objects to reach desired states
  • Watches a Kubernetes Resource for changes, with error recovery