【运维发布】日志采样：高流量日志的采样降耗设计

local ERROR_SAMPLE, DEBUG_ON = 1, false
local counters = { err = 0, act = 0 }
local function writeLog(kind, line)
    if kind == "err" then
        counters.err = counters.err + 1
        saveLog("ERR", line)
        return
    end
    if kind == "act" then
        counters.act = counters.act + 1
        if counters.act % 10 == 0 then
            saveLog("ACT", line)
        end
        return
    end
    if DEBUG_ON then
        saveLog("DBG", line)
    end
end

local function setSampleRate(rate)
    setsysvarex("ACT_SAMPLE_RATE", rate, 1)
end
local function currentRate()
    return tonumber(getsysvar("ACT_SAMPLE_RATE") or "10") or 10
end