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/usr/share/check_mk/checks/nvidia is in check-mk-server 1.2.6p12-1.

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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 2014             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.

nvidia_temp_default_levels = (60, 65, 90, 95)

def inventory_nvidia_temp(info):
    return [ (l[0].strip(":"), "nvidia_temp_default_levels")
            for l in info
            if l[0].strip(":").lower().endswith("temp") ]

def check_nvidia_temp(item, params, info):
    for l in info:
        if l[0].strip(":") == item:
            temp = int(l[1])
            if item == "GPUCoreTemp":
                warn, crit = params[2:4]
            else:
                warn, crit = params[0:2]

            return check_temperature(temp, (warn, crit))

check_info["nvidia.temp"] = {
    'check_function':          check_nvidia_temp,
    'inventory_function':      inventory_nvidia_temp,
    'service_description':     'Temperature NVIDIA %s',
    'has_perfdata':            True,
    'includes':                [ 'temperature.include' ],
}


def inventory_nvidia_errors(info):
    for line in info:
        if line[0] == 'GPUErrors:':
            return [(None, None)]

def check_nvidia_errors(_no_item, _no_params, info):
    for line in info:
        if line[0] == "GPUErrors:":
            errors = int(line[1])
            if errors == 0:
                return (0, "No GPU errors")
            else:
                return (2, "%d GPU errors" % errors)
    return (3, "incomplete output from agent")

check_info["nvidia.errors"] = {
    'check_function':          check_nvidia_errors,
    'inventory_function':      inventory_nvidia_errors,
    'service_description':     'NVIDIA GPU Errors',
    'group':                   'hw_errors',
}