curl localhost:4444/grid/status -sS | jq "."
{
  "node_list": [
    {
      "key": "10.9.241.207:6666",
      "type": "persistent",
      "address": "10.9.241.207:6666",
      "status": "available",
      "session_id": "",
      "updated": 1572215422,
      "registered": 1572215422,
      "capabilities_list": [
        {
          "browserName": "firefox",
          "marionette": true,
          "maxInstances": 5,
          "platform": "MAC",
          "platformName": "MAC",
          "seleniumProtocol": "WebDriver",
          "server:CONFIG_UUID": "d4771bc0-6349-47be-8f10-f3198e5cd12f"
        },
        {
          "browserName": "chrome",
          "maxInstances": 5,
          "platform": "MAC",
          "platformName": "MAC",
          "seleniumProtocol": "WebDriver",
          "server:CONFIG_UUID": "25cb856d-913c-4f45-ae88-91a76d82e712"
        },
        {
          "browserName": "safari",
          "maxInstances": 1,
          "platform": "MAC",
          "platformName": "MAC",
          "seleniumProtocol": "WebDriver",
          "server:CONFIG_UUID": "5756e9c5-6b3a-4578-afa6-b029d00ad32e",
          "technologyPreview": false
        }
      ]
    }
  ],
  "config": {
    "logger": {
      "level": "debug"
    },
    "db": {
      "implementation": "local",
      "connection": ""
    },
    "grid": {
      "client_type": "selenium",
      "port": 4444,
      "strategy_list": [
        {
          "params": null,
          "type": "persistent",
          "limit": 0,
          "node_list": null
        }
      ],
      "busy_node_duration": "15m",
      "reserved_node_duration": "5m"
    }
  }
}