Add mellanox_hca_temp text collector example (#1128)

* deleted_libraries: Upgrade to Python 3

Python 2.7 will not be maintained past 2020. Therefore upgrade
text_collector_examples/deleted_libraries.py to Python 3.

* Add mellanox_hca_temp text collector example

mellanox_hca_temp is a script that reads Mellanox HCA temperature using
the Mellanox mget_temp_ext tool.

Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>

text_collector_examples/deleted_libraries.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """
 Script to count the number of deleted libraries that are linked by running
 processes and expose a summary as Prometheus metrics.
@@ -20,7 +20,7 @@ def main():
         try:
             with open(path, 'rb') as file:
                 for line in file:
-                    part = line.strip().split()
+                    part = line.decode().strip().split()
 
                     if len(part) == 7:
                         library = part[5]
@@ -42,9 +42,9 @@ def main():
 
     num_processes_per_library = {}
 
-    for process, library_count in processes_linking_deleted_libraries.iteritems():
+    for process, library_count in processes_linking_deleted_libraries.items():
         libraries_seen = set()
-        for library, count in library_count.iteritems():
+        for library, count in library_count.items():
             if library in libraries_seen:
                 continue
 
@@ -59,7 +59,7 @@ def main():
     print('# HELP {0} {1}'.format(metric_name, description))
     print('# TYPE {0} gauge'.format(metric_name))
 
-    for library, count in num_processes_per_library.iteritems():
+    for library, count in num_processes_per_library.items():
         dir_path, basename = os.path.split(library)
         basename = basename.replace('"', '\\"')
         dir_path = dir_path.replace('"', '\\"')

text_collector_examples/mellanox_hca_temp

@@ -0,0 +1,59 @@
+#!/bin/bash
+set -eu
+
+# Script to read Mellanox HCA temperature using the Mellanox mget_temp_ext tool
+
+# Copyright 2018 The Prometheus Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Author: Jan Phillip Greimann <jan.greimann@cloud.ionos.com>
+
+# check if root
+if [ "$EUID" -ne 0 ]; then
+    echo "${0##*/}: Please run as root!" >&2
+    exit 1
+fi
+
+# check if programs are installed
+if ! command -v mget_temp_ext >/dev/null 2>&1; then
+    echo "${0##*/}: mget_temp_ext is not installed. Aborting." >&2
+    exit 1
+fi
+
+cat <<EOF
+# HELP node_infiniband_hca_temp_celsius Celsius temperature of Mellanox InfiniBand HCA.
+# TYPE node_infiniband_hca_temp_celsius gauge
+EOF
+
+# run for each found Mellanox device
+for dev in /sys/class/infiniband/*; do
+    if test ! -d "$dev"; then
+        continue
+    fi
+    device="${dev##*/}"
+
+    # get temperature
+    if temperature="$(mget_temp_ext -d "${device}")"; then
+        # output
+        echo "node_infiniband_hca_temp_celsius{hca_device=\"${device}\"} ${temperature//[[:space:]]/}"
+    else
+        echo "${0##*/}: Failed to get temperature from InfiniBand HCA '${device}'!" >&2
+    fi
+done
+
+# if device is empty, no device was found
+if [ -z "${device-}" ]; then
+    echo "${0##*/}: No InfiniBand HCA device found!" >&2
+    exit 1
+fi