【工具链】数据看板：核心指标的实时大屏

---全局定时器 43 号：每 5 秒采集一轮
setontimerex(43, 5)
function Board.collect()
    local online = grobalinfo(6)
    local now = os.time()
    Board.push("online", online, now)
    Board.push("peak_today", Board.peakOf("online"), now)
    Board.push("maps_active", Board.activeMaps(), now)
    Board.push("kick_rate", Board.kickRatio(), now)
end

function Board.push(key, value, at)
    Board.series[key] = Board.series[key] or {}
    local arr = Board.series[key]
    arr[#arr + 1] = { v = value, at = at }
    if #arr > 17280 then table.remove(arr, 1) end
end

---指标快照推给大屏前端，异常即告警
function Board.snapshot()
    local snap = {}
    for key, arr in pairs(Board.series) do
        snap[key] = arr[#arr].v
    end
    Board.checkAlarm(snap)
    return snap
end

function Board.checkAlarm(snap)
    if snap.kick_rate > 0.03 then
        Board.alert("掉线率超标: " .. snap.kick_rate)
    end
    if snap.online > 0 and snap.peak_today < snap.online * 0.5 then
        Board.alert("在线骤降过半，疑似网络或登录故障")
    end
end