website/content/en/docs/reference/command-line-tools-reference/feature-gates/SidecarContainers.md

title	content_type	_build	stages
SidecarContainers	feature_gate	list render never false	stage defaultValue fromVersion toVersion alpha false 1.28 1.28 stage defaultValue fromVersion beta true 1.29

Allow setting the restartPolicy of an init container to Always so that the container becomes a sidecar container (restartable init containers). See Sidecar containers and restartPolicy for more details.