以下使用Python開發一個簡單的metric實例： 在/usr/lib64/ganglia/python_modules/中創建random_number.py並加入例如以下代碼

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import random
import time
descriptors = list()
def random_number_1(name):
    return int(random.uniform(5, 100)) + 10
def random_number_2(name):
    return int(random.randrange(50, 500))
def metric_init(params):
    global descriptors
    random.seed()
    print params
    d1 = {
        'name': 'random_number_1',
        'call_back': random_number_1,
        'time_max': 90,
        'value_type': 'uint',
        'units': 'C',
        'slope': 'both',
        'format': '%u',
        'description': 'Random a number',
        'groups': 'example random'
    }
    d2 = {
        'name': 'random_number_2',
        'call_back': random_number_2,
        'time_max': 90,
        'value_type': 'uint',
        'units': 'C',
        'slope': 'both',
        'format': '%u',
        'description': 'Random a number',
        'groups': 'example random'
    }
    descriptors = [d1, d2]
    return descriptors
def metric_cleanup():
    pass

#This code is for debugging and unit testing
if __name__ == '__main__':
    metric_init({})
    while True:
        for d in descriptors:
            v = d['call_back'](d['name'])
            print ('value for %s is '+d['format']) % (d['name'], v)
        time.sleep(5)

modules { module { #這裏的name值一定要與/usr/lib64/ganglia/python_modules/random_number.py的文件名稱保持一致，否則將無法正確執行 name = "random_number" language = "python" } }
collection_group { collect_every = 2 time_threshold = 90
metric { #這裏的name值要與random_number.py中的d1裏的name保持一致 name = "random_number_1" title = "random number 1" value_threshold = 0 }
metric { #這裏的name值要與random_number.py中的d2裏的name保持一致 name = "random_number_2" title = "random number 2" value_threshold = 0 } }

service gmond restart service gmetad restart service httpd restart