public static Pair<String, Map<String, String>> parseAddAttr(String additionStr) {
        Map<String, String> attr = new HashMap<>();
        String[] split = additionStr.split(ADDITION_SPLITTER);
        String mValue = "";
        for (String s : split) {
            if (!s.contains(EQUAL)) {
                continue;
            }
            String[] pairs = s.split(EQUAL);
            if (pairs[0].equalsIgnoreCase(M_VALUE)) {
                mValue = pairs[1];
                continue;
            }
            getAttrs(attr, s, pairs);
        }
        return Pair.of(mValue, attr);
    }
Parse addition attr, the attributes must be sent in proxy sender
inlong-agent/agent-common/src/main/java/org/apache/inlong/agent/utils/AgentUtils.java