Provide useful JSON endpoints for Grid

[lukeis]

Originally reported on Google Code with ID 5586

Feature enhancement request:

I'd like to be able to hit Selenium Grid and get back a JSON telling me the current
status of the Grid.

Example:

{
  "nodes": 5,
  "capabilities": [  ],
  "sessions": [
    {
      "browser": "Internet Explorer",
      "version": "7",
      "platform": "Windows XP"
    },
    {
      "browser": "Google Chrome",
      "version": "13",
      "platform": "Linux"
    }
  ]
}

Right now the Grid UI doesn't really give useful information about what's happening
on the Grid. I'd like to be able to monitor it without having to ssh into a box and
tail logs. Providing this sort of endpoint

Reported by rquinlivan@thebrighttag.com on 2013-05-01 22:07:21

[lukeis]

Reported by barancev on 2013-05-05 21:17:26

• Labels added: Type-Enhancement, Component-Grid
• Labels removed: Type-Defect

[lukeis]

Reported by barancev on 2013-05-12 17:49:25

• Labels added: GettingInvolved

[lukeis]

Reported by a.u.savchuk on 2013-08-15 19:59:52

• Status changed: Accepted

[lukeis]

This would be a useful feature. Has there been any traction on it?

Reported by mledesma831 on 2014-05-07 15:28:58

[lukeis]

I think I want to pick this up

Reported by Dima.Kovalenko on 2014-10-06 19:05:09

[lukeis]

Reported by luke.semerau on 2015-09-17 17:45:11

• Labels added: Restrict-AddIssueComment-Commit