###
# set external Alertmanager
POST http://admin:admin@localhost:3000/api/v1/ngalert/admin_config
content-type: application/json

{
  "alertmanagers": ["http://localhost:9093"]
}

###
GET http://admin:admin@localhost:3000/api/v1/ngalert/admin_config

###
# after a few minutes it should be discovered
GET http://admin:admin@localhost:3000/api/v1/ngalert/alertmanagers

###
# remove it
POST http://admin:admin@localhost:3000/api/v1/ngalert/admin_config
content-type: application/json

{
  "alertmanagers": []
}

###
# check again
GET http://admin:admin@localhost:3000/api/v1/ngalert/alertmanagers