itamae/cookbooks/prometheus/files/etc/consul.d/service-snmp_exporter.json

{
  "service": {
    "name": "snmp_exporter",
    "port": 9116,
    "check":{
      "tcp": "127.0.0.1:9116",
      "interval": "60s",
      "timeout": "1s",
      "success_before_passing": 3
    }
  }
}