user="xxxxxxx"
host="hoge.foo.bar.com"
password="secret"
port=12345

threshold=1.5
from="hoge@foo.bar.com"
to=["bar@hoge.honya.com"].to_java("String")

newJSch.withSession(user,host,:password=>password,:port=>port) {|session|
  session.exec("w") {|is|
    @load_average = is.gets.gsub(/.+load average: /, "").split(",").collect{|num|num.to_f}
  }
}
if @load_average[2] >= threshold
  if defined?(MailSupport)
    msg = createJisMailMessage
    msg.subject = "監視アラート from matoi"
    msg.text = "#{host}の 15分平均CPU使用率が#{threshold}を超過(#{@load_average[2]})"
    msg.from = from
    msg.to = to
    sendMailMessage(msg)
  end
end
@load_average[2].to_s.toByteArray.download("text/plain")