Knative Scale-to-Zero and Cold Start Sequence

Knative Scale-to-Zero and Cold Start Sequence A sequence diagram generated by Archify. Scale to 0 (terminate pod after grace period) zero metrics over stable-window (60s) → terminated after grace period Set Activator as destination HTTP request Forward request (no pod) Request scale-up Activator buffers the request Scale to 1 (create pod) Container started + Ready Forward buffered request HTTP response Next request Direct delivery (bypass Activator) Scale-to-Zero — zero requests for stable-window (60s) Cold start — new request arrives Subsequent requests go directly Client · Sequence participant Client Gateway · Kourier · Sequence participant Gateway Kourier Activator · Sequence participant Activator Autoscaler · Sequence participant Autoscaler Pod · Queue Proxy + App · Sequence participant Pod Queue Proxy + App Legend request return default message