TypeError: Object of type 'function' is not JSON serializable from CLI when running heartbeat alert

[jurgenhaas]

Issue Summary

Running alerta heartbeats is showing all heartbeat records ok. When running alerta heartbeats --alert this exception is being thrown:

Traceback (most recent call last):
  File "/usr/local/bin/alerta", line 8, in <module>
    sys.exit(cli())
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.6/dist-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/click/decorators.py", line 33, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/alertaclient/commands/cmd_heartbeats.py", line 100, in cli
    customer=b.customer
  File "/usr/local/lib/python3.6/dist-packages/alertaclient/api.py", line 65, in send_alert
    r = self.http.post('/alert', data)
  File "/usr/local/lib/python3.6/dist-packages/alertaclient/api.py", line 519, in post
    response = self.session.post(url, data=json.dumps(data, cls=CustomJsonEncoder),
  File "/usr/lib/python3.6/json/__init__.py", line 238, in dumps
    **kw).encode(obj)
  File "/usr/lib/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/local/lib/python3.6/dist-packages/alertaclient/utils.py", line 18, in default
    return json.JSONEncoder.default(self, o)
  File "/usr/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type 'function' is not JSON serializable

Environment

• OS: Ubuntu 18.04 LTS

• API version: 7.4.4

• Deployment: Docker

• For self-hosted: no WSGI, just the alerta/alerta_web container behind Apache proxy

• Database: Postgres

• Server config:
  Auth enabled? Yes
  Auth provider? GitLab
  Customer views? Yes

{"actions":[],"alarm_model":{"colors":{"severity":{"cleared":"#00CC00","critical":"red","debug":"#9D006D","indeterminate":"lightblue","informational":"#00CC00","major":"orange","minor":"yellow","normal":"#00CC00","ok":"#00CC00","security":"blue","trace":"#7554BF","unknown":"silver","warning":"dodgerblue"},"text":"black"},"defaults":{"normal_severity":"normal","previous_severity":"indeterminate","status":"open"},"name":"Alerta 7.4.4","severity":{"cleared":7,"critical":1,"debug":8,"indeterminate":5,"informational":6,"major":2,"minor":3,"normal":7,"ok":7,"security":0,"trace":9,"unknown":10,"warning":4},"status":{"ack":"C","assign":"B","blackout":"E","closed":"F","expired":"G","open":"A","shelved":"D","unknown":"H"}},"audio":{"new":null},"auth_required":true,"aws_region":"us-east-1","azure_tenant":"common","client_id":"0e0d1f1df40e2cde0ca3989b654b102aaed761f9bf104cfef4e00bc65e059f58","cognito_domain":null,"colors":{"severity":{"cleared":"#00CC00","critical":"red","debug":"#9D006D","indeterminate":"lightblue","informational":"#00CC00","major":"orange","minor":"yellow","normal":"#00CC00","ok":"#00CC00","security":"blue","trace":"#7554BF","unknown":"silver","warning":"dodgerblue"},"text":"black"},"columns":["severity","status","lastReceiveTime","timeoutLeft","duplicateCount","customer","environment","service","resource","event","value"],"customer_views":true,"dates":{"longDate":"ddd D MMM, YYYY HH:mm:ss.SSS Z","mediumDate":"ddd D MMM HH:mm","shortTime":"HH:mm"},"debug":false,"email_verification":false,"endpoint":"https://alerta.lakedrops.com/api","filter":{"status":["open","ack"]},"github_url":"https://github.com","gitlab_url":"https://gitlab.lakedrops.com","indicators":{"queries":[{"query":[["environment","Production"]],"text":"Production"},{"query":[["environment","Development"]],"text":"Development"},{"query":{"q":"event:Heartbeat"},"text":"Heartbeats"},{"query":"group=Misc","text":"Misc."}],"severity":["critical","major","minor","warning","indeterminate","informational"]},"keycloak_realm":null,"keycloak_url":null,"oidc_auth_url":"https://gitlab.lakedrops.com/oauth/authorize","provider":"gitlab","refresh_interval":5000,"severity":{"cleared":7,"critical":1,"debug":8,"indeterminate":5,"informational":6,"major":2,"minor":3,"normal":7,"ok":7,"security":0,"trace":9,"unknown":10,"warning":4},"signup_enabled":false,"site_logo_url":"","sort_by":"lastReceiveTime","tracking_id":null}

• web UI version: 7.4.4
• CLI version: 7.4.4

To Reproduce
Steps to reproduce the behavior:

1. Just running alerta heartbeats --alert

Additional context

docker-compose.yml

version: '2.1'
services:
  web:
    image: alerta/alerta-web
    ports:
      - "8091:8080"
    depends_on:
      - db
    volumes:
      - ./config/alertad.conf:/app/alertad.conf
      - ./config/config.json:/web/config.json
    environment:
      - DATABASE_URL=postgres://postgres:postgres@db:5432/monitoring
      - BASE_URL=https://alerta.lakedrops.com/api
    restart: always
  db:
    image: postgres
    volumes:
      - ./pg-data:/var/lib/postgresql/data
    environment:
      POSTGRES_DB: monitoring
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
    restart: always

config/alertad.conf

BASE_URL='https://alerta.lakedrops.com/api'
AUTH_REQUIRED=True
AUTH_PROVIDER='gitlab'
SECRET_KEY='XYZ'
ADMIN_USERS=['some entries']
CUSTOMER_VIEWS=True

# OAuth
GITLAB_URL='https://gitlab.lakedrops.com'
OAUTH2_CLIENT_ID='XYZ'
OAUTH2_CLIENT_SECRET='XYZ'
ALLOWED_GITLAB_GROUPS=['some strings']

# Plugins
PLUGINS=['reject','blackout','normalise','enhance']
ORIGIN_BLACKLIST=[]
ALLOWED_ENVIRONMENTS=['some strings']

config/config.json

{
  "endpoint": "https://alerta.lakedrops.com/api",
  "base_path": "/",
  "provider": "gitlab",
  "client_id": "XYZ",
  "gitlab_url": "https://gitlab.lakedrops.com"
}

[satterly]

Duplicate of #204