使用python测试prometheus的实现
为了更直观的了解prometheus如何工作,本文使用prometheus的python库来做一些相应的测试。
python库的github地址是https://github.com/prometheus
根据提示,使用pip安装prometheus_client
pip3 install prometheus_client
然后根据文档中的示例文件并简单修改,运行一个client
文件命名为prometheus_python_client.py
from prometheus_client import start_http_server, Summary
import random
import time
import sys
# Create a metric to track time spent and requests made.
REQUEST_TIME = Summary ('request_processing_seconds', 'Time spent processing request')
# Decorate function with metric.
@REQUEST_TIME.time ( )
def process_request(t):
    """A dummy function that takes some time."""
    time.sleep (t)
if __name__ == '__main__':
    try:
        if sys.argv[1].isdigit():
            port = sys.argv[1]
        else:
            port = 8080
    except:
        port = 8080
    # Start up the server to expose the metrics.
    start_http_server (8080)
    # Generate some requests.
    while True:
        process_request (random.random ( ))
在后台运行client
pytho3 prometheus_python_client.py 8080 &
此时可以访问本机的8080端口,可以看到相应的metric
curl 127.0.0.1:8080/metrics
得到如图所示结果

为了能监控到这个端口为8080的目标,需要在prometheus的配置文件prometheus.yml进行一些修改
在scrape_configs块部分加上一个新的job
scrape_configs: # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config. - job_name: "prometheus" # metrics_path defaults to '/metrics' # scheme defaults to 'http'. static_configs: - targets: ["localhost:9090"] - job_name: 'python-client' scrape_interval: 5s static_configs: - targets: ['localhost:8080'] labels: group: 'python-client-group'
重启prometheus,并访问其web页面,在Expression中输入一个python client的metric并执行
可以看到对应的结果正如在scrape_configs中所配置的相一致。

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