Add support for Pod metrics.

Author: brendandburns

examples/src/main/java/io/kubernetes/client/examples/MetricsExample.java

@@ -13,8 +13,10 @@
 package io.kubernetes.client.examples;
 
 import io.kubernetes.client.Metrics;
+import io.kubernetes.client.custom.ContainerMetrics;
 import io.kubernetes.client.custom.NodeMetrics;
 import io.kubernetes.client.custom.NodeMetricsList;
+import io.kubernetes.client.custom.PodMetrics;
 import io.kubernetes.client.openapi.ApiClient;
 import io.kubernetes.client.openapi.ApiException;
 import io.kubernetes.client.openapi.Configuration;
@@ -45,5 +47,22 @@ public static void main(String[] args) throws IOException, ApiException {
       }
       System.out.println();
     }
+
+    for (PodMetrics item : metrics.getPodMetrics("default").getItems()) {
+      System.out.println(item.getMetadata().getName());
+      System.out.println("------------------------------");
+      if (item.getContainers() == null) {
+        continue;
+      }
+      for (ContainerMetrics container : item.getContainers()) {
+        System.out.println(container.getName());
+        System.out.println("-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-");
+        for (String key : container.getUsage().keySet()) {
+          System.out.println("\t" + key);
+          System.out.println("\t" + container.getUsage().get(key));
+        }
+        System.out.println();
+      }
+    }
   }
 }

kubernetes/src/main/java/io/kubernetes/client/custom/ContainerMetrics.java

@@ -0,0 +1,36 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package io.kubernetes.client.custom;
+
+import java.util.Map;
+
+public class ContainerMetrics {
+  private String name;
+  private Map<String, Quantity> usage;
+
+  public String getName() {
+    return name;
+  }
+
+  public Map<String, Quantity> getUsage() {
+    return usage;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public void setUsage(Map<String, Quantity> usage) {
+    this.usage = usage;
+  }
+}

kubernetes/src/main/java/io/kubernetes/client/custom/PodMetrics.java

@@ -0,0 +1,74 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package io.kubernetes.client.custom;
+
+import io.kubernetes.client.common.KubernetesObject;
+import io.kubernetes.client.openapi.models.V1ObjectMeta;
+import java.util.List;
+
+public class PodMetrics implements KubernetesObject {
+  private String apiVersion;
+  private String kind;
+  private V1ObjectMeta metadata;
+  private String timestamp;
+  private String window;
+  private List<ContainerMetrics> containers;
+
+  public String getApiVersion() {
+    return apiVersion;
+  }
+
+  public String getKind() {
+    return kind;
+  }
+
+  public V1ObjectMeta getMetadata() {
+    return metadata;
+  }
+
+  public String getTimestamp() {
+    return timestamp;
+  }
+
+  public String getWindow() {
+    return window;
+  }
+
+  public List<ContainerMetrics> getContainers() {
+    return containers;
+  }
+
+  public void setApiVersion(String apiVersion) {
+    this.apiVersion = apiVersion;
+  }
+
+  public void setKind(String kind) {
+    this.kind = kind;
+  }
+
+  public void setMetadata(V1ObjectMeta metadata) {
+    this.metadata = metadata;
+  }
+
+  public void setTimestamp(String timestamp) {
+    this.timestamp = timestamp;
+  }
+
+  public void setWindow(String window) {
+    this.window = window;
+  }
+
+  public void setContainers(List<ContainerMetrics> containers) {
+    this.containers = containers;
+  }
+}

kubernetes/src/main/java/io/kubernetes/client/custom/PodMetricsList.java

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package io.kubernetes.client.custom;
+
+import io.kubernetes.client.common.KubernetesListObject;
+import io.kubernetes.client.openapi.models.V1ListMeta;
+import java.util.List;
+
+public class PodMetricsList implements KubernetesListObject {
+  private String apiVersion;
+  private String kind;
+  private V1ListMeta metadata;
+  private List<PodMetrics> items;
+
+  public String getApiVersion() {
+    return apiVersion;
+  }
+
+  public String getKind() {
+    return kind;
+  }
+
+  public V1ListMeta getMetadata() {
+    return metadata;
+  }
+
+  public List<PodMetrics> getItems() {
+    return items;
+  }
+
+  public void setApiVersion(String apiVersion) {
+    this.apiVersion = apiVersion;
+  }
+
+  public void setKind(String kind) {
+    this.kind = kind;
+  }
+
+  public void setMetadata(V1ListMeta metadata) {
+    this.metadata = metadata;
+  }
+
+  public void setItems(List<PodMetrics> items) {
+    this.items = items;
+  }
+}

util/src/main/java/io/kubernetes/client/Metrics.java

@@ -14,6 +14,8 @@
 
 import io.kubernetes.client.custom.NodeMetrics;
 import io.kubernetes.client.custom.NodeMetricsList;
+import io.kubernetes.client.custom.PodMetrics;
+import io.kubernetes.client.custom.PodMetricsList;
 import io.kubernetes.client.openapi.ApiClient;
 import io.kubernetes.client.openapi.ApiException;
 import io.kubernetes.client.openapi.Configuration;
@@ -65,4 +67,11 @@ public NodeMetricsList getNodeMetrics() throws ApiException {
             apiClient);
     return metricsClient.list().getObject();
   }
+
+  public PodMetricsList getPodMetrics(String namespace) throws ApiException {
+    GenericKubernetesApi<PodMetrics, PodMetricsList> metricsClient =
+        new GenericKubernetesApi<>(
+            PodMetrics.class, PodMetricsList.class, "metrics.k8s.io", "v1beta1", "pods", apiClient);
+    return metricsClient.list(namespace).getObject();
+  }
 }