api_key = '' service_name = '' import requests import json import pprint headers = { 'X-Api-Key': api_key, } r = requests.get(f"https://api.mackerelio.com/api/v0/services/{service_name}/metric-names", headers=headers, ) metric_names = json.loads(r.text)['names'] for metric_name in metric_names: print(metric_name)