Kubernetes Java API for Metrics

The Resource Metrics API is not included in the official Java client library. so you have to query the API server as following:

GET /apis/metrics/v1alpha1/namespaces/{namespace}/pods/{pod}

which will return the results of current metrics.

Here are a few references with ability to add even more custom metrics:

• https://blog.jetstack.io/blog/resource-and-custom-metrics-hpa-v2/
• https://github.com/kubernetes/metrics

Hope this answers your question.

as blue man said, it is now possible to get this metrics
Java Solution

PodMetricsList list = new Metrics(client).getPodMetrics("playground");

for(PodMetrics podMetrics:list.getItems()){
    for(ContainerMetrics containerMetrics:podMetrics.getContainers()){
                System.out.println(containerMetrics.getUsage());
    }
}

Kotlin Solution

val client = Config.defaultClient();
Configuration.setDefaultApiClient(client);
Metrics(client).getPodMetrics(
        "name-space"
).items.forEach {
    it.containers.forEach {metrics ->
        println(metrics.usage)
    }
}

This should give the metrics you are looking for.

Sample Output

{cpu=Quantity{number=0.011135729, format=DECIMAL_SI}, memory=Quantity{number=831680512, format=BINARY_SI}}

{cpu=Quantity{number=0.008742460, format=DECIMAL_SI}, memory=Quantity{number=781041664, format=BINARY_SI}}