jenkinsPluginStats.groovy

@Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.7.1' )

import static groovyx.net.http.Method.GET
import static groovyx.net.http.ContentType.*

def http = new groovyx.net.http.HTTPBuilder('http://stats.jenkins-ci.org/')

def plugins
http.request(GET,HTML) { req ->
  uri.path = '/plugin-installation-trend/'
  response.success = { resp, html ->
    plugins = html.BODY.TABLE
  }
}

plugins.TBODY.TR.eachWithIndex{ it, i ->
  //skip header and footer rows
  if( i > 2 && i < plugins.TBODY.TR.size() ){ 
    def path = it.TD[1].A.@href
    http.request(GET,JSON) { req ->
      uri.path = "/plugin-installation-trend/${path}"
      response.success = { resp, json ->
        println "${json.name} | ${json.installations?.max{ it.key }.value}"
      }
    }
  }
}