enum FullAction

Specifies the different alternatives when a file group or tree of file groups is full.
A file group is considered full when, unless an action is taken, the file group exceeds a define limit.

References from:
FileGroupPolicy;

1
DISCARD_NEWEST
A file must not be stored if that would cause the defined limit to be exceeded.
Instead, the current or newest file is discarded.
2
DISCARD_OLDEST
The oldest file(s) are removed to free up space for the newest file.
When a new file is stored and it causes the file group or the hierarchical tree of file groups to exceed its limit, the oldest file in the file group or tree of file groups is deleted before storing the new file.
  enum FullAction