This will be sent after or with a `read_time` that is
greater than or equal to the time at which the targets were
added.
Listeners can wait for this change if read-after-write
semantics are desired.
RESET (4):
The targets have been reset, and a new initial state for the
targets will be returned in subsequent changes.
After the initial state is complete, `CURRENT` will be
returned even if the target was previously indicated to be
`CURRENT`.
Enums
Name
Description
NO_CHANGE
No change has occurred. Used only to send an updated `resume_token`.
ADD
The targets have been added.
REMOVE
The targets have been removed.
CURRENT
The targets reflect all changes committed before the targets were added to the stream.