List Prometheus targets status

prometheus_tagets.py

#!/usr/bin/env python3
import json
import sys
import urllib.request
from urllib.error import URLError
import textwrap

def fetch_targets(prometheus_url):
    try:
        with urllib.request.urlopen(f"{prometheus_url}/api/v1/targets") as response:
            return json.loads(response.read().decode('utf-8'))
    except URLError as e:
        print(f"Error fetching data: {e}", file=sys.stderr)
        sys.exit(1)

def parse_targets(data):
    targets = []
    for target in data['data']['activeTargets']:
        targets.append({
            'job': target['labels'].get('job', 'N/A'),
            'instance': target['labels'].get('instance', 'N/A'),
            'state': target['health'],
            'lastError': target.get('lastError', '')
        })
    return targets

def print_table(targets):
    job_width = max(20, max(len(t['job']) for t in targets))
    instance_width = max(30, max(len(t['instance']) for t in targets))
    state_width = 10
    error_width = 50

    header = f"{'Job':<{job_width}} {'Instance':<{instance_width}} {'State':<{state_width}} {'Last Error':<{error_width}}"
    print(header)
    print("-" * len(header))

    for target in targets:
        job = target['job']
        instance = target['instance']
        state = target['state']
        error = target['lastError']

        print(f"{job:<{job_width}} {instance:<{instance_width}} {state:<{state_width}}", end=" ")
        
        if error:
            wrapped_error = textwrap.wrap(error, width=error_width)
            print(wrapped_error[0])
            for line in wrapped_error[1:]:
                print(f"{'':<{job_width + instance_width + state_width + 3}}{line}")
        else:
            print()

def main():
    prometheus_url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:9090"
    data = fetch_targets(prometheus_url)
    targets = parse_targets(data)
    print_table(targets)

if __name__ == "__main__":
    main()