【运维发布】磁盘水位治理：日志轮转策略与写入量兜底

local seq = 0
local function writeLog(level, text)
    seq = seq + 1
    if level == "debug" and seq % 10 ~= 1 then return end
    local line = os.date("%H:%M:%S") .. " [" .. level .. "] " .. text
    setsysvar("LOG_TAIL", line)
end

local function checkRotate(sizeMB)
    if sizeMB >= 100 then
        writeLog("info", "log rotate at " .. sizeMB .. "MB")
        return true
    end
    if sizeMB >= 80 then
        writeLog("warn", "disk usage high: " .. sizeMB .. "%")
    end
    return false
end