【运维发布】监控告警：指标分级与值班路由

---告警分级：P0 电话、P1 群@、P2 群消息
local LEVELS = {
    P0 = { via = "phone",  recover = 5 },
    P1 = { via = "at",     recover = 30 },
    P2 = { via = "msg",    recover = 0 },
}

function Alert.fire(level, key, detail)
    local cfg = LEVELS[level]
    if not cfg then return end
    Alert.push(cfg.via, level, key, detail)
    Alert.record(key, level, os.time())
end

---分级示例
Alert.fire("P0", "login_fail_spike", "登录失败率 40%，持续 3 分钟")
Alert.fire("P1", "slave_lag", "从库延迟 4 秒")
Alert.fire("P2", "disk_70", "磁盘使用率 72%")

---路由：按时段找人，深夜升级
setontimerex(45, 60)
function Alert.route()
    local hour = tonumber(os.date("%H"))
    for _, a in ipairs(Alert.pending) do
        if a.level == "P0" or (hour >= 22 or hour < 8) and a.level == "P1" then
            Alert.toOnCall(a)      -- 深夜 P1 升级为呼叫
        else
            Alert.toGroup(a)
        end
    end
    Alert.pending = {}
end