openresty-lua-timer

-- create timer
local resty_timer = require("resty.timer")
local interval = 5 -- seconds
local health_mode = "healthy"
local CHECK_JITTER = 0.1

local function callback ()

end

local timer_uuid, err = resty_timer({
    interval = interval,
    recurring = true,
    immediate = true,
    detached = true,
    expire = callback,
    cancel = nil,
    shm_name = self.shm_name,
    key_name = self.PERIODIC_LOCK .. health_mode,
    sub_interval = math.min(interval, 0.5),
    jitter = CHECK_JITTER,
}, self.name, health_mode)
if not timer_uuid then
    -- log
end