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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.attributes;

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

public class AttributesUtils {

    public static Map appendAttributePrefixes(Map> input) {
        if (input == null || input.isEmpty()) {
            return Collections.emptyMap();
        }

        Map toReturn = new HashMap<>();
        String prefix;
        Map attributes;
        for (Entry> current : input.entrySet()) {
            prefix = current.getKey();
            attributes = current.getValue();
            if (attributes != null) {
                for (Entry att : attributes.entrySet()) {
                    toReturn.put(prefix + att.getKey(), att.getValue());
                }
            }
        }
        return toReturn;
    }

}