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I created a script to retrieve the WCPU of RPD in OIDs, but it's not functioning as expected. Could someone assist me with this?

version 1.0;

ns junos = "http://xml.juniper.net/junos/*/junos";

ns xnm = "http://xml.juniper.net/xnm/1.1/xnm";

ns jcs = "http://xml.juniper.net/junos/commit-scripts/1.0";

ns ext = "http://xmlsoft.org/XSLT/namespace";

match / {

    <op-script-results> {

        var $cmd = <command> "show system processes extensive";

        var $out = jcs:invoke($cmd);

        var $lines = jcs:break-lines($out);

        for-each ($lines) {

            if (contains(., "rpd{rpd}")) {

                var $pattern = "[0-9]+\s+root\s+[0-9]+\s+[0-9]+\s+[0-9]+[MKG]\s+[0-9]+[MKG]\s+CPU1\s+[0-9]+\s+[0-9]+:[0-9]+\s+([0-9]+\.[0-9]+%)\s+rpd\{rpd\}";

                var $match = jcs:regex($pattern, .);

                var $cpu_usage = $match[1];

                var $rpc = <request-snmp-utility-mib-set> {

                    <object-type> "integer";

                    <instance> "RPD_normalized_cpu";

                    <object-value> $cpu_usage;

                };

                var $res = jcs:invoke($rpc);

            }

        }

    }

}