This is any string associated with a jail. It can be set upon jail creation
or added/modified later:
# jail -cm ... meta="tag1=value1 tag2=value2"
Its value is not inherited from a parent jail. A jail can read its own
meta via security.jail.meta sysctl.
The maximum meta size per jail is controlled with a global
security.jail.meta_maxbufsize sysctl. Decreasing it does not alter the
existing meta information.
MFC after: 3 months
Sponsored by: SkunkWerks GmbH