gistfile1.lua

local os    = require "os"
local alert = require "alert"

alert.set_throttle(60 * 1e9)

local host1 = "box1"
local host2 = "box2"

while true do 
  local current_time = os.time() * 1e9
  if not alert.throttled(current_time, host1) then
    alert.send(current_time, host1, "host1 alert")
  end
  
  if not alert.throttled(current_time, host2) then
    alert.send(current_time, host2, "host2 alert")
  end
end