On Kubernetes runtimes, keepAliveTraffic is an enforcement rule for job procedures. If the configured pod RX-byte window elapses below the expected traffic threshold, druid stops that procedure cleanly and lets the command run mode decide what runs next.
For Minecraft coldstarter scrolls, attach keepAliveTraffic to the real runtime procedure's main expected port. Do not attach it to the coldstarter procedure; the standby listener must remain available while idle.
Minecraft scrolls should use 10kb/5m on the real runtime main port. Server-list pings are small and should not keep a runtime warm; active clients generate recurring keep-alive/play traffic and should keep the runtime alive.