<p>The protobuf API for the CRI in Kubernetes 1.5 can be found <a href="https://github.com/kubernetes/kubernetes/blob/release-1.5/pkg/kubelet/api/v1alpha1/runtime/api.proto" rel="nofollow noreferrer">here</a>. Where is the latest version of this file?</p>

dippynark
<p>This API was <a href="https://github.com/kubernetes/kubernetes/commit/33081c1f07be128a89441a39c467b7ea2221b23d#diff-c9533c2c855d722d8416950cff5092a4" rel="nofollow noreferrer">recently</a> broken out to its own repository: <a href="https://github.com/kubernetes/cri-api" rel="nofollow noreferrer"><code>kubernetes/cri-api</code></a>.</p>

<p>You can still find the protobuf API within the main repository: <a href="https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/cri-api/" rel="nofollow noreferrer">kubernetes/staging/src/k8s.io/cri-api</a>.</p>
