Add health probe configuration to Kubernetes deployment guide (#665)

src/pages/use-cases/cloud/routing-peers-and-kubernetes.mdx

@@ -99,8 +99,33 @@ spec:
                 - NET_ADMIN
                 - SYS_RESOURCE
                 - SYS_ADMIN
+          livenessProbe:
+            exec:
+              command: ["netbird", "status", "--check", "live"]
+            initialDelaySeconds: 5
+            periodSeconds: 10
+            timeoutSeconds: 5
+            failureThreshold: 3
+          readinessProbe:
+            exec:
+              command: ["netbird", "status", "--check", "ready"]
+            initialDelaySeconds: 5
+            periodSeconds: 10
+            timeoutSeconds: 5
+            failureThreshold: 3
+          startupProbe:
+            exec:
+              command: ["netbird", "status", "--check", "startup"]
+            periodSeconds: 2
+            timeoutSeconds: 10
+            failureThreshold: 30
 ```
 
+The health probes use `netbird status --check` to verify the client state:
+- **live**: checks that the daemon process is responsive
+- **ready**: checks that the client is not in an authentication-required state (NeedsLogin, LoginFailed, SessionExpired)
+- **startup**: checks that management and signal are connected, and that at least one relay server is available if any are configured
+
 Edit your deployment.yml file, incorporating the setup key into the relevant sections.
 
 Apply the updated deployment file to your Kubernetes cluster using the following command: