Document host* and shareProcessNamespace flags

docs/serving/configuration/feature-flags.md

@@ -516,6 +516,7 @@ spec:
 * **ConfigMap key:** `kubernetes.podspec-schedulername`
 
 This flag controls whether a [`scheduler name`](https://kubernetes.io/docs/concepts/scheduling-eviction/kube-scheduler/) can be specified.
+
 ```yaml
 apiVersion: serving.knative.dev/v1
 kind: Service
@@ -527,3 +528,83 @@ spec:
  schedulerName: custom-scheduler-example
 ...
 ```
+
+### Kubernetes Share Process Namespace
+
+* **Type**: Extension
+* **ConfigMap key:** `kubernetes.podspec-shareprocessnamespace`
+
+This flag controls whether the [share process namespace](https://kubernetes.io/docs/tasks/configure-pod-container/share-process-namespace/) can be used.
+
+```yaml
+apiVersion: serving.knative.dev/v1
+kind: Service
+...
+spec:
+ template:
+ spec:
+ ...
+ shareProcessNamespace: true
+...
+```
+
+!!! warning
+
+ `shareProcessNamespace` and `hostPID` cannot both be set.
+
+### Kubernetes Host IPC
+
+* **Type**: Extension
+* **ConfigMap key:** `kubernetes.podspec-hostipc`
+
+This flag controls whether the host's ipc namespace can be used.
+
+```yaml
+apiVersion: serving.knative.dev/v1
+kind: Service
+...
+spec:
+ template:
+ spec:
+ ...
+ hostIPC: true
+...
+```
+
+### Kubernetes Host PID
+
+* **Type**: Extension
+* **ConfigMap key:** `kubernetes.podspec-hostpid`
+
+This flag controls whether the host's pid can be used.
+
+```yaml
+apiVersion: serving.knative.dev/v1
+kind: Service
+...
+spec:
+ template:
+ spec:
+ ...
+ hostPID: true
+...
+```
+
+### Kubernetes Host Network
+
+* **Type**: Extension
+* **ConfigMap key:** `kubernetes.podspec-hostnetwork`
+
+This flag controls whether the host's network namespace can be used.
+
+```yaml
+apiVersion: serving.knative.dev/v1
+kind: Service
+...
+spec:
+ template:
+ spec:
+ ...
+ hostNetwork: true
+...
+```