website/content/en/docs/reference/command-line-tools-reference/feature-gates/immutable-ephemeral-volumes.md

title	content_type	_build	stages	removed
ImmutableEphemeralVolumes	feature_gate	list render never false	stage defaultValue fromVersion toVersion alpha false 1.18 1.18 stage defaultValue fromVersion toVersion beta true 1.19 1.20 stage defaultValue fromVersion toVersion stable true 1.21 1.24	true

Allows for marking individual Secrets and ConfigMaps as immutable for better safety and performance.