icinga2-checks/check_graylog_index_size.py

#!/usr/bin/env python3
import argparse
import sys
import traceback

import requests

from checker import nagios
from checker.result import quit_check


def main(args):
    data = {}  # make pycharm happy
    try:
        r = requests.get('http://localhost:9200/_cat/nodes?v&h=n,ip,disk*&format=json')
        r.raise_for_status()
        data = r.json()[0]
    except Exception as e:
        quit_check(f'Failed to reach Elasticsearch: {e}', nagios.STATE_CRIT)

    perfdata = {
        'disk_used': {
            'value': data['disk.used'],
            'min': 0,
        },
        'disk_total': {
            'value': data['disk.total'],
            'min': 0,
        },
        'disk_avail': {
            'value': data['disk.avail'],
        },
        'disk_used_percent': {
            'value': data['disk.used_percent'],
            'unit': '%'
        }
    }

    used_percent_float = float(data['disk.used_percent'])
    warn_percent = args.size_warn_percent
    crit_percent = args.size_crit_percent
    exit_str = f"{data['disk.used_percent']}% disk used ({data['disk.used'].upper()} / {data['disk.total'].upper()}). {data['disk.avail'].upper()} available."
    exit_code = nagios.STATE_OK

    if used_percent_float >= crit_percent:
        exit_code = nagios.STATE_CRIT
    elif used_percent_float >= warn_percent:
        exit_code = nagios.STATE_WARN
    quit_check(exit_str, exit_code, perfdata)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='Check the Graylog index size.')
    parser.add_argument('--size-warn-percent', default=50, type=float)
    parser.add_argument('--size-crit-percent', default=65, type=float)
    args = parser.parse_args()
    try:
        main(args)
    except Exception as e:
        print(f'UNKNOWN: exception "{e}"')
        print(traceback.format_exc())
        sys.exit(nagios.STATE_UNKNOWN)