scrapper.py

from flask import request
from prometheus_client import Counter, Histogram
import time
import sys
#  initializing objects metrics type counter
REQUEST_COUNT = Counter(
    'request_count', 'App Request Count',
    ['app_name', 'method', 'endpoint', 'http_status']
)
#  initializing objects metrics type Histogram
REQUEST_LATENCY = Histogram('request_latency_seconds', 'Request latency',
    ['app_name', 'endpoint']
)

def start_timer():
    request.start_time = time.time()

def stop_timer(response):
    #lable metrics
    resp_time = time.time() - request.start_time
    REQUEST_LATENCY.labels('webapp', request.path).observe(resp_time)
    return response

def record_request_data(response):
    # lable metrics
    REQUEST_COUNT.labels('webapp', request.method, request.path,
            response.status_code).inc()
    return response

def setup_metrics(app):
    app.before_request(start_timer)
    app.after_request(record_request_data)
    app.after_request(stop_timer)