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Jar required to run with a java application to monitor performance.

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/*
 *
 *  * Copyright 2020 New Relic Corporation. All rights reserved.
 *  * SPDX-License-Identifier: Apache-2.0
 *
 */

package com.newrelic.agent.utilization;

import com.newrelic.agent.config.SystemPropertyProvider;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class KubernetesData {

    static final String KUBERNETES_SERVICE_HOST_ENV = "KUBERNETES_SERVICE_HOST";
    static final String KUBERNETES_SERVICE_HOST_KEY = "kubernetes_service_host";

    static final KubernetesData EMPTY_KUBERNETES_DATA = new KubernetesData(Collections.emptyMap());

    private final Map kubernetesData;

    private KubernetesData(Map kubernetesData) {
        this.kubernetesData = kubernetesData;
    }

    static KubernetesData extractKubernetesValues(SystemPropertyProvider systemPropertyProvider) {
        Map kubernetesData = new HashMap<>();

        String kubernetesServiceHost = systemPropertyProvider.getEnvironmentVariable(KUBERNETES_SERVICE_HOST_ENV);
        if (kubernetesServiceHost != null) {
            kubernetesData.put(KUBERNETES_SERVICE_HOST_KEY, kubernetesServiceHost);
        }

        return new KubernetesData(kubernetesData);
    }

    public Map getValueMap() {
        return kubernetesData;
    }

}