Rancher Stack upgrading zero downtime


i am using rancher now since 1.1 (if i remeber right) since then always when i upgrade the Stack (Network service, IPSEC …) i got a downtime of my services.

Is there a way to do that with a zero downtime? otherwise always i have to upgrade these services i got a downtime.

(right now i did a upgrade from 1.3.4 to 1.4.1 and faced this issue)

I hope its clear what i am. Pleas let me know if you need more information.