doc: extend PodResources API for Dynamic Resource Allocation

Signed-off-by: Moshe Levi <[email protected]>

Author: moshe010

content/en/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins.md

@@ -213,6 +213,7 @@ for these devices:
 service PodResourcesLister {
     rpc List(ListPodResourcesRequest) returns (ListPodResourcesResponse) {}
     rpc GetAllocatableResources(AllocatableResourcesRequest) returns (AllocatableResourcesResponse) {}
+    rpc Get(GetPodResourcesRequest) returns (GetPodResourcesResponse) {}
 }
 ```
 
@@ -223,6 +224,14 @@ id of exclusively allocated CPUs, device id as it was reported by device plugins
 the NUMA node where these devices are allocated. Also, for NUMA-based machines, it contains the
 information about memory and hugepages reserved for a container.
 
+Starting from Kubernetes v1.27, the `List` enpoint can provide information on resources
+of running pods allocated in `ResourceClaims` by the `DynamicResourceAllocation` API. To enable
+this feature `kubelet` must be started with the following flags:
+
+```
+--feature-gates=DynamicResourceAllocation=true,KubeletPodResourcesDynamiceResources=true
+```
+
 ```gRPC
 // ListPodResourcesResponse is the response returned by List function
 message ListPodResourcesResponse {
@@ -242,6 +251,7 @@ message ContainerResources {
     repeated ContainerDevices devices = 2;
     repeated int64 cpu_ids = 3;
     repeated ContainerMemory memory = 4;
+    repeated DynamicResource dynamic_resources = 5;
 }
 
 // ContainerMemory contains information about memory and hugepages assigned to a container
@@ -267,6 +277,28 @@ message ContainerDevices {
     repeated string device_ids = 2;
     TopologyInfo topology = 3;
 }
+
+// DynamicResource contains information about the devices assigned to a container by Dynamic Resource Allocation
+message DynamicResource {
+    string class_name = 1;
+    string claim_name = 2;
+    string claim_namespace = 3;
+    repeated ClaimResource claim_resources = 4;
+}
+
+// ClaimResource contains per-plugin resource information
+message ClaimResource {
+    repeated CDIDevice cdi_devices = 1 [(gogoproto.customname) = "CDIDevices"];
+}
+
+// CDIDevice specifies a CDI device information
+message CDIDevice {
+    // Fully qualified CDI device name
+    // for example: vendor.com/gpu=gpudevice1
+    // see more details in the CDI specification:
+    // https://github.com/container-orchestrated-devices/container-device-interface/blob/main/SPEC.md
+    string name = 1;
+}
 ```
 {{< note >}}
 cpu_ids in the `ContainerResources` in the `List` endpoint correspond to exclusive CPUs allocated
@@ -333,6 +365,36 @@ Support for the `PodResourcesLister service` requires `KubeletPodResources`
 [feature gate](/docs/reference/command-line-tools-reference/feature-gates/) to be enabled.
 It is enabled by default starting with Kubernetes 1.15 and is v1 since Kubernetes 1.20.
 
+### `Get` gRPC endpoint {#grpc-endpoint-get}
+
+{{< feature-state state="alpha" for_k8s_version="v1.27" >}}
+
+The `Get` endpoint provides information on resources of a running Pod. It exposes information
+similar to those described in the `List` endpoint. The `Get` endpoint requires `PodName`
+and `PodNamespace` of the running Pod.
+
+```gRPC
+// GetPodResourcesRequest contains information about the pod
+message GetPodResourcesRequest {
+    string pod_name = 1;
+    string pod_namespace = 2;
+}
+```
+
+To enable this feature, you must start your kubelet services with the following flag:
+
+```
+--feature-gates=KubeletPodResourcesGet=true
+```
+
+The `Get` endpoint can provide Pod information related to dynamic resources
+allocated by the dynamic resource allocation API. To enable this feature, you must
+ensure your kubelet services are started with the following flags:
+
+```
+--feature-gates=KubeletPodResourcesGet=true,DynamicResourceAllocation=true,KubeletPodResourcesDynamiceResources=true
+```
+
 ## Device plugin integration with the Topology Manager
 
 {{< feature-state for_k8s_version="v1.18" state="beta" >}}

content/en/docs/concepts/scheduling-eviction/dynamic-resource-allocation.md

@@ -162,6 +162,12 @@ gets scheduled onto one node and then cannot run there, which is bad because
 such a pending Pod also blocks all other resources like RAM or CPU that were
 set aside for it.
 
+## Monitoring resources
+
+The kubelet provides a gRPC service to enable discovery of dynamic resources of
+running Pods. For more information on the gRPC endpoints, see the
+[resource allocation reporting](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#monitoring-device-plugin-resources).
+
 ## Limitations
 
 The scheduler plugin must be involved in scheduling Pods which use

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -125,8 +125,10 @@ For a reference to old feature gates that are removed, please refer to
 | `KubeletInUserNamespace` | `false` | Alpha | 1.22 | |
 | `KubeletPodResources` | `false` | Alpha | 1.13 | 1.14 |
 | `KubeletPodResources` | `true` | Beta | 1.15 | |
+| `KubeletPodResourcesGet` | `false` | Alpha | 1.27 | |
 | `KubeletPodResourcesGetAllocatable` | `false` | Alpha | 1.21 | 1.22 |
 | `KubeletPodResourcesGetAllocatable` | `true` | Beta | 1.23 | |
+| `KubeletPodResourcesDynamicResources` | `false` | Alpha | 1.27 | |
 | `KubeletTracing` | `false` | Alpha | 1.25 | |
 | `LegacyServiceAccountTokenTracking` | `false` | Alpha | 1.25 | |
 | `LocalStorageCapacityIsolationFSQuotaMonitoring` | `false` | Alpha | 1.15 | - |
@@ -578,9 +580,14 @@ Each feature gate is designed for enabling/disabling a specific feature:
 - `KubeletPodResources`: Enable the kubelet's pod resources gRPC endpoint. See
   [Support Device Monitoring](https://github.com/kubernetes/enhancements/blob/master/keps/sig-node/606-compute-device-assignment/README.md)
   for more details.
+- `KubeletPodResourcesGet`: Enable the `Get` gRPC endpoint on kubelet's for Pod resources.
+  This API augments the [resource allocation reporting](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#monitoring-device-plugin-resources).
 - `KubeletPodResourcesGetAllocatable`: Enable the kubelet's pod resources
   `GetAllocatableResources` functionality. This API augments the
   [resource allocation reporting](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#monitoring-device-plugin-resources)
+- `KubeletPodResourcesDynamiceResources`: Extend the kubelet's pod resources gRPC endpoint to
+  to include resources allocated in `ResourceClaims` via `DynamicResourceAllocation` API.
+  See [resource allocation reporting](/docs/concepts/extend-kubernetes/compute-storage-net/device-plugins/#monitoring-device-plugin-resources) for more details.
   with informations about the allocatable resources, enabling clients to properly
   track the free compute resources on a node.
 - `KubeletTracing`: Add support for distributed tracing in the kubelet.