【运维发布】灰度回滚线：放量异常的自动回收

-- 灰度回滚线：指标比对
local player = class(actor)
local BASELINE = {errRate = 1.5, dcRate = 2.0}
local function compareMetrics(player, grayErr, grayDc)
    local errDev = grayErr - BASELINE.errRate
    local dcDev = grayDc - BASELINE.dcRate
    if errDev > BASELINE.errRate or grayErr > 3 then
        sendmsg(player, 1, 0, "错误率异常：灰度 " .. grayErr .. "% vs 基线 " .. BASELINE.errRate .. "%")
        return true
    end
    if dcDev > 1 then
        sendmsg(player, 1, 0, "掉线率异常：灰度 " .. grayDc .. "% vs 基线 " .. BASELINE.dcRate .. "%")
        return true
    end
    return false
end

-- 灰度回滚线：自动回收
local player = class(actor)
local function autoRollback(player, trainId, reason)
    local cur = tonumber(getsysvar("GrayPct_" .. trainId) or 0)
    local stable = tonumber(getsysvar("GrayStable_" .. trainId) or 0)
    setsysvarex("GrayPct_" .. trainId, stable, true)
    setsysvarex("GrayLock_" .. trainId, 1, true)
    setsysvarex("RollbackLog_" .. trainId,
        os.date("%Y%m%d%H%M") .. "|" .. cur .. "->" .. stable .. "|" .. reason, true)
    sendcentermsg(player, 255, 0, trainId .. " 灰度已自动回退，等待修复确认。", 0, 8)
end