Open two windows logged onto the bastion host (I'm using tools-sgebastion-08). Become your tool. In one window, tail -f an existing file.
In the other window, connect to a kubernetes node with "webservice --backend=kubernetes python3.7 shell", and append something to that file, using "echo foo >> filename".
Watch how long it takes for that to show up in the tail output. I've captured an example in this video where it takes about 15 seconds. The bottom window is the tail on the bastion host. The top window is the k8s node. I've seen it take as long as 90 seconds. I've seen it show up in as little as 1 or 2 seconds.
I first noticed this when tailing my uwsgi.log file, and was able to reproduce it with logging from inside my django app.