首先,为您的Load平均定义添加一个事件处理程序：

define service{
    use                     generic-service
    host_name               xx
    service_description     Load_Average
    check_command           check_nrpe!check_load
    event_handler           processes_snapshot!xx
    contact_groups          admin-sms
}

processes_snapshot命令在commands.cfg中定义：

define command{
    command_name    processes_snapshot
    command_line    $USER1$/eventhandlers/processes_snapshot.sh $SERVICESTATE$$SERVICESTATETYPE$$SERVICEATTEMPT$$HOSTADDRESS$
}

第二,编写事件处理程序脚本(processes_snapshot.sh)：

#!/bin/bash

case "$1" in
    OK)
        ;;
    WARNING)
        /usr/local/nagios/libexec/check_nrpe -H $4 -c processes_snapshot
        ;;
    UNKNOWN)
        ;;
    CRITICAL)
        /usr/local/nagios/libexec/check_nrpe -H $4 -c processes_snapshot
        ;;
esac

exit 0

命令processes_snapshot在xx主机上的nrpe.cfg中定义,如下所示：

command[processes_snapshot]=top -cSbn 1 | tail -n +8 | sort -rn -k11 | head > /tmp/proc_snap.txt

PS：我还没有测试过这个配置.