Starting an HTTP Server for Prometheus Metrics Exposure

Start an HTTP server that exposes Prometheus metrics.

Technology Stack : prometheus_client

Code Type : HTTP Server

Code Difficulty : Intermediate

                
                    
import random
from prometheus_client import Collector, Gauge, start_http_server

def random_prometheus_function():
    # Select a random function from Prometheus Client library
    functions = [
        "create_a_simple_collector",
        "start_an_http_server",
        "register_a_gauge",
        "create_a_counter"
    ]
    selected_function = random.choice(functions)

    # Define the function based on the selected function
    if selected_function == "create_a_simple_collector":
        def create_a_simple_collector():
            # Create a simple collector that exposes a gauge
            class SimpleCollector(Collector):
                def __init__(self):
                    super().__init__('simple_collector', 'A simple collector', ['label'])
                    self.gauge = Gauge('simple_gauge', 'A simple gauge', ['label'])

                def collect(self):
                    # Simulate collecting some data
                    self.gauge.set(10, label='example')
            return SimpleCollector()
        
        # Code JSON
        code_json = {
            "type": "Collector",
            "hard": "中级",
            "explain": "创建一个简单的Prometheus收集器，用于暴露一个带有标签的度量。",
            "tench": "prometheus_client",
            "explain_en": "Create a simple Prometheus collector that exposes a gauge with labels.",
            "tench_en": "prometheus_client"
        }
    
    elif selected_function == "start_an_http_server":
        def start_an_http_server():
            # Start an HTTP server that exposes metrics
            start_http_server(8000)
        
        # Code JSON
        code_json = {
            "type": "HTTP Server",
            "hard": "中级",
            "explain": "启动一个HTTP服务器，用于暴露Prometheus指标。",
            "tench": "prometheus_client",
            "explain_en": "Start an HTTP server that exposes Prometheus metrics.",
            "tench_en": "prometheus_client"
        }
    
    elif selected_function == "register_a_gauge":
        def register_a_gauge():
            # Register a gauge metric
            gauge = Gauge('example_gauge', 'An example gauge', ['label'])
            gauge.set(5, label='example')
        
        # Code JSON
        code_json = {
            "type": "Gauge Metric",
            "hard": "中级",
            "explain": "注册一个度量指标，并设置其值。",
            "tench": "prometheus_client",
            "explain_en": "Register a gauge metric and set its value.",
            "tench_en": "prometheus_client"
        }
    
    elif selected_function == "create_a_counter":
        def create_a_counter():
            # Create a counter metric
            counter = Gauge('example_counter', 'An example counter', ['label'])
            counter.inc(label='example')
        
        # Code JSON
        code_json = {
            "type": "Counter Metric",
            "hard": "中级",
            "explain": "创建一个计数器指标，并增加其值。",
            "tench": "prometheus_client",
            "explain_en": "Create a counter metric and increment its value.",
            "tench_en": "prometheus_client"
        }
    
    # Execute the selected function
    return selected_function, locals()[selected_function]()