要使用python編寫Prometheus監控，需要你先開啟Prometheus集群。可以參考//www.jb51.net/article/148895.htm 安裝。在python中實現服務器端。在Prometheus中配置請求網址，Prometheus會定期向該網址發起申請獲取你想要返回的數據。

使用Python和Flask編寫Prometheus監控

Installation

pip install flaskpip install prometheus_client

Metrics

Prometheus提供4種類型Metrics：Counter, Gauge, Summary和Histogram

Counter

Counter可以增長，并且在程序重啟的時候會被重設為0，常被用于任務個數，總處理時間，錯誤個數等只增不減的指標。

import prometheus_clientfrom prometheus_client import Counterfrom prometheus_client.core import CollectorRegistryfrom flask import Response, Flaskapp = Flask(__name__)requests_total = Counter("request_count", "Total request cout of the host")@app.route("/metrics")def requests_count():  requests_total.inc()  # requests_total.inc(2)  return Response(prometheus_client.generate_latest(requests_total),          mimetype="text/plain")@app.route('/')def index():  requests_total.inc()  return "Hello World"if __name__ == "__main__":  app.run(host="0.0.0.0")

運行該腳本，訪問youhost:5000/metrics

# HELP request_count Total request cout of the host# TYPE request_count counterrequest_count 3.0

Gauge

Gauge與Counter類似，唯一不同的是Gauge數值可以減少，常被用于溫度、利用率等指標。

import randomimport prometheus_clientfrom prometheus_client import Gaugefrom flask import Response, Flaskapp = Flask(__name__)random_value = Gauge("random_value", "Random value of the request")@app.route("/metrics")def r_value():  random_value.set(random.randint(0, 10))  return Response(prometheus_client.generate_latest(random_value),          mimetype="text/plain")if __name__ == "__main__":  app.run(host="0.0.0.0")

運行該腳本，訪問youhost:5000/metrics

# HELP random_value Random value of the request# TYPE random_value gaugerandom_value 3.0

Summary/Histogram

Summary/Histogram概念比較復雜，一般exporter很難用到，暫且不說。

LABELS

使用labels來區分metric的特征

from prometheus_client import Counterc = Counter('requests_total', 'HTTP requests total', ['method', 'clientip'])c.labels('get', '127.0.0.1').inc()c.labels('post', '192.168.0.1').inc(3)c.labels(method="get", clientip="192.168.0.1").inc()

使用Python和asyncio編寫Prometheus監控

from prometheus_client import Counter, Gaugefrom prometheus_client.core import CollectorRegistryREGISTRY = CollectorRegistry(auto_describe=False)requests_total = Counter("request_count", "Total request cout of the host", registry=REGISTRY)random_value = Gauge("random_value", "Random value of the request", registry=REGISTRY)