Yep, I was looking into running Jobs with Sidecars awhile back and came across this issue. I was actually surprised this morning to see a link on HN be in the "already read" state. Nice to see this feature merged, however our Cluster is on 1.25 I think? Probably a ways away from being able to use this.
this is great for things like Jobs and Istio
eliminates the scheme where the main container had to signal to the sidecar it was exiting otherwise the pod would hang