【运维发布】定时任务治理：crontab 的集中管理

local TASKS = {
    { name = "daily_backup", node = "node_a", cron = "0 3 * * *", owner = "运维组" },
    { name = "log_cleanup",  node = "node_a", cron = "0 4 * * *", owner = "运维组" },
    { name = "rank_refresh", node = "node_b", cron = "*/5 * * * *", owner = "开发组" },
}
local function checkConflict()
    local slotMap = {}
    for _, t in ipairs(TASKS) do
        local slot = t.node .. "_" .. t.cron
        if slotMap[slot] then
            sendmail("#运维组", 956, "定时任务冲突", slot .. " 存在冲突任务", "")
        end
        slotMap[slot] = true
    end
end

local EXEC_LOG = {}
local function executeTask(taskName)
    local t0 = os.time()
    local ok = pcall(callScript, taskName)
    local cost = os.time() - t0
    EXEC_LOG[taskName] = { ts = t0, cost = cost, ok = ok }
    if not ok then
        sendmail("#运维组", 957, "定时任务失败", taskName .. " 执行失败", "")
    end
end