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/usr/share/check_mk/checks/cpu is in check-mk-server 1.1.12-1ubuntu1.

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The actual contents of the file can be viewed below.

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#!/usr/bin/python
# -*- encoding: utf-8; py-indent-offset: 4 -*-
# +------------------------------------------------------------------+
# |             ____ _               _        __  __ _  __           |
# |            / ___| |__   ___  ___| | __   |  \/  | |/ /           |
# |           | |   | '_ \ / _ \/ __| |/ /   | |\/| | ' /            |
# |           | |___| | | |  __/ (__|   <    | |  | | . \            |
# |            \____|_| |_|\___|\___|_|\_\___|_|  |_|_|\_\           |
# |                                                                  |
# | Copyright Mathias Kettner 2010             mk@mathias-kettner.de |
# +------------------------------------------------------------------+
#
# This file is part of Check_MK.
# The official homepage is at http://mathias-kettner.de/check_mk.
#
# check_mk is free software;  you can redistribute it and/or modify it
# under the  terms of the  GNU General Public License  as published by
# the Free Software Foundation in version 2.  check_mk is  distributed
# in the hope that it will be useful, but WITHOUT ANY WARRANTY;  with-
# out even the implied warranty of  MERCHANTABILITY  or  FITNESS FOR A
# PARTICULAR PURPOSE. See the  GNU General Public License for more de-
# ails.  You should have  received  a copy of the  GNU  General Public
# License along with GNU Make; see the file  COPYING.  If  not,  write
# to the Free Software Foundation, Inc., 51 Franklin St,  Fifth Floor,
# Boston, MA 02110-1301 USA.


cpuload_default_levels = (5, 10)
threads_default_levels = (2000.0, 4000.0)

def inventory_cpu_load(info):
    if len(info) == 1 and len(info[0]) >= 5:
        return [(None, "", "cpuload_default_levels")]

def check_cpu_load(item, params, info):
    try:
        load = []
        for i in [ 0, 1, 2 ]:
            load.append(float(info[0][i]))
        if len(info[0]) >= 6:
            num_cpus = int(info[0][5])
        else:
            num_cpus = 1
    except:
        return (3, "Unknown - invalid or incomplete output from plugin")

    warn, crit = params # apply on 15min average, relative to number of CPUs
    warn = warn * num_cpus
    crit = crit * num_cpus
    perfdata = [ ('load' + str(z), l, warn, crit, 0 ) for (z,l) in [ (1,load[0]), (5,load[1]), (15, load[2]) ] ]

    if load[2] >= crit:
        return (2, "CRIT - 15min Load %.2f at %s CPUs (critical at %.2f)" % (load[2], num_cpus, crit), perfdata)
    elif load[2] >= warn:
        return (1, "WARN - 15min Load %.2f at %s CPUs (warning at %.2f)" % (load[2], num_cpus, warn), perfdata)
    else:
        return (0, "OK - 15min Load %.2f at %s CPUs" % (load[2], num_cpus), perfdata)

def inventory_cpu_threads(info):
    if len(info) == 1 and len(info[0]) >= 5:
        return [(None, "", "threads_default_levels")]

def check_cpu_threads(item, params, info):
    try:
        nthreads = int(info[0][3].split('/')[1])
    except:
        return (3, "UNKNOWN - invalid output from plugin")
    warn, crit = params
    perfdata = [('threads', nthreads, warn, crit, 0 )]
    if nthreads >= crit:
        return (2, "CRIT - %d threads (critical at %d)" % (nthreads, crit), perfdata)
    elif nthreads >= warn:
        return (1, "WARN - %d threads (warning %d)" % (nthreads, warn), perfdata)
    else:
        return (0, "OK - %d threads" % (nthreads,), perfdata)

check_info['cpu.loads'] = (check_cpu_load, "CPU load", 1,  inventory_cpu_load )
check_info['cpu.threads'] = (check_cpu_threads, "Number of threads", 1,  inventory_cpu_threads)