gpu: doc: monitoring resource notes

Also align xelink-sidecar deployment with the new files in
the xpu manager project.

Signed-off-by: Tuomas Katila <[email protected]>

cmd/gpu_plugin/README.md

@@ -53,7 +53,7 @@ For workloads on different KMDs, see [KMD and UMD](#kmd-and-umd).
 
 | Flag | Argument | Default | Meaning |
 |:---- |:-------- |:------- |:------- |
-| -enable-monitoring | - | disabled | Enable 'i915_monitoring' resource that provides access to all Intel GPU devices on the node |
+| -enable-monitoring | - | disabled | Enable '*_monitoring' resource that provides access to all Intel GPU devices on the node, [see use](./monitoring.md) |
 | -resource-manager | - | disabled | Enable fractional resource management, [see use](./fractional.md) |
 | -shared-dev-num | int | 1 | Number of containers that can share the same GPU device |
 | -allocation-policy | string | none | 3 possible values: balanced, packed, none. For shared-dev-num > 1: _balanced_ mode spreads workloads among GPU devices, _packed_ mode fills one GPU fully before moving to next, and _none_ selects first available device from kubelet. Default is _none_. Allocation policy does not have an effect when resource manager is enabled. |

cmd/gpu_plugin/monitoring.md

@@ -0,0 +1,32 @@
+# Monitoring GPUs
+
+## i915_monitoring resource
+
+GPU plugin can be configured to register a monitoring resource for the nodes that have Intel GPUs on them. `gpu.intel.com/i915_monitoring` (or `gpu.intel.com/xe_monitoring`) is a singular resource on the nodes. A container requesting it, will get access to _all_ the Intel GPUs (`i915` or `xe` KMD device files) on the node. The idea behind this resource is to allow the container to _monitor_ the GPUs. A container requesting the `i915_monitoring` resource would typically export data to some metrics consumer. An example for such a consumer is [Prometheus](https://prometheus.io/).
+
+<figure>
+  <img src="monitoring.png"/>
+  <figcaption>Monitoring Pod listening to all GPUs while one Pod is using a GPU.</figcaption>
+</figure>
+
+For the monitoring applications, there are two possibilities: [Intel XPU Manager](https://github.com/intel/xpumanager/) and [collectd](https://github.com/collectd/collectd/tree/collectd-6.0). Intel XPU Manager is readily available as a container and with a deployment yaml. collectd has Intel GPU support in its 6.0 branch, but there are no public containers available for it.
+
+To deploy XPU Manager to a cluster, one has to run the following kubectl:
+```
+$ kubectl apply -k https://github.com/intel/xpumanager/deployment/kubernetes/daemonset/base
+```
+
+This will deploy an XPU Manager daemonset to run on all the nodes having the `i915_monitoring` resource.
+
+## Prometheus integration with XPU Manager
+
+For deploying Prometheus to a cluster, see [this page](https://prometheus-operator.dev/docs/user-guides/getting-started/). One can also use Prometheus' [helm chart](https://github.com/prometheus-community/helm-charts).
+
+Prometheus requires additional Kubernetes configuration so it can fetch GPU metrics. The following steps will add a Kubernetes Service and a ServiceMonitor components. The components instruct Prometheus how and where from to retrieve the metrics.
+
+```
+$ kubectl apply -f https://raw.githubusercontent.com/intel/xpumanager/master/deployment/kubernetes/monitoring/service-intel-xpum.yaml
+$ kubectl apply -f https://raw.githubusercontent.com/intel/xpumanager/master/deployment/kubernetes/monitoring/servicemonitor-intel-xpum.yaml
+```
+
+With those components in place, one can query Intel GPU metrics from Prometheus with `xpum_` prefix.

deployments/xpumanager_sidecar/kustom/kustom_xpumanager.yaml

@@ -27,8 +27,3 @@ spec:
             - ALL
           readOnlyRootFilesystem: true
           runAsUser: 0
-      - name: xpumd
-        resources:
-          limits:
-            $patch: replace
-            gpu.intel.com/i915_monitoring: 1

deployments/xpumanager_sidecar/kustomization.yaml

@@ -1,5 +1,5 @@
 resources:
-- https://raw.githubusercontent.com/intel/xpumanager/V1.2.18/deployment/kubernetes/daemonset-intel-xpum.yaml
+- https://github.com/intel/xpumanager/deployment/kubernetes/daemonset/base/?ref=V1.2.29
 namespace: monitoring
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization