This scenario which the environment using mode IAP. please install requirement below

apt-get install python python-pip nginx git -y

pip-install netmiko prometheus_client

Then create a python script to collect data client per AP as IAP Collector, for example the script name “collect_iap.py” then copy the script below

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#!/usr/bin/env python
from netmiko import ConnectHandler
from netmiko.ssh_exception import NetMikoTimeoutException
from netmiko.ssh_exception import AuthenticationException
from paramiko.ssh_exception import SSHException
import json,time,os
with open('devices_iap') as f:
    devices_list = f.read().splitlines()
for a_device in devices_list:
    hostname = a_device
    aos_device = {
        'device_type': 'aruba_os',
        'ip': hostname,
        'username': 'your_username',
        'password': 'your_password'
    }
    # if one of devices down, the script will running next job
    try:
        net_connect= ConnectHandler(**aos_device)
    except (AuthenticationException):
        print 'auth failure ' + hostname
        continue
    except (NetMikoTimeoutException):
        print 'IP Timeout ' + hostname
        continue
    except (EOFError):
        print 'End of file while attempting device ' + hostname
        continue
    except (SSHException):
        print 'SSH not enble ' + hostname
        continue
    except Exception as unknown_error:
        print 'unknown error ' + str(unknown_error)
        continue
    net_connect = ConnectHandler(**aos_device)
    excecute_command = net_connect.send_command("show ap association | in Num")
    parse_command = excecute_command[12:16]
    result = "{} ".format(aos_device['ip']) +  parse_command + "\n"
    print result
    output_file = open("output.txt", "a")
    output_file.write(result)
    output_file.close()
print "Convert to JSON File"
commands = {}
with open("output.txt") as fh:
    for line in fh:
        command, description = line.strip().split(' ', 1)
        commands[command] = description.strip()
print(json.dumps(commands, indent=2, sort_keys=True))
with open('/var/www/html/aruba_iap.json', 'w') as json_file:
    json.dump(commands, json_file)
time.sleep(20)
remove_file = os.system("rm -rf output.txt")
print "Done"
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

root@vm-prom-collector:/home/aruba_os# chmod +x collect_iap.py

Define list of devices in /etc/hosts

192.168.232.2 IAP325_02
192.168.232.3 IAP325_03
192.168.232.4 IAP325_04
192.168.232.5 IAP325_05

Make sure the script is running properly

root@vm-prom-collector:/home/aruba_os# python collect_iap.py
Collecting data…..
Convert to JSON File
{
“IAP325_03”: “2”,
“IAP325_03”: “6”,
“IAP325_04”: “0”,
“IAP325_05”: “4”,
}
Done

Create JSON exporter, Actually the script already created by other. Please clone the script from repository

root@vm-prom-collector:/home/rohmat/aruba_os# git clone https://github.com/project-sunbird/prometheus-jsonpath-exporter.git

root@vm-prom-collector:/home/rohmat/aruba_os# cd prometheus-jsonpath-exporter/

root@vm-prom-collector:/home/rohmat/aruba_os/prometheus-jsonpath-exporter# nano example/config_aruba.yml

Copy the script below in /home/rohmat/aruba_os/prometheus-jsonpath-exporter/example/config_aruba.yml

exporter_port: 9158 
 log_level: info
 json_data_url: http://192.168.38.60/aruba_os.json 
 metric_name_prefix: aruba
 metrics:
 - name: CAP325_02
   description: Aruba test
   path: $.CAP325_02
 - name: CAP325_02
   description: Aruba test
   path: $.CAP325_02
 - name: CAP325_03
   description: Aruba test
   path: $.CAP325_03
 - name: CAP325_04
   description: Aruba test
   path: $.AP325_04 

Create linux service in folder /lib/systemd/system, so it can auto start after rebooted

root@vm-prom-collector:/home/rohmat/aruba_os#nano /lib/systemd/sysem/aruba_exporter.service

[Unit]
Description=service exporter iap aruba
After=multi-user.target
[Service]
Type=idle
ExecStart=/usr/bin/python /opt/prometheus-jsonpath-exporter/app/exporter.py /opt/prometheus-jsonpath-exporter/example/config_aruba.yml
[Install]
WantedBy=multi-user.target

root@vm-prom-collector:/home/rohmat/aruba_os# systemctl daemon-reload

root@vm-prom-collector:/home/rohmat/aruba_os# system restart aruba_exporter.service

Setup Prometheus & Grafana. I assumse this scenario already setup prometheus server, if you have no environment please follow this step : Prometheus : https://www.booleanworld.com/install-use-prometheus-monitoring/
Grafana : https://grafana.com/docs/installation/debian/

Configure prometheus server to srap data from json exporter, this scenario prometheus server & json exporter in the same server. please add configuration file in /etc/prometheus/prometheus.yml

job_name: 'aruba_os_iap' 
scrape_interval: 30s 
static_configs: 
  - targets: ['localhost:9158'] 

Restart the service prometheus, “systemctl restart prometheus”

Create metrics in Grafana