Default type for the enum. Value should
never be returned.
The TARGET_NUM_WORKERS_CHANGED type should be used when the
target worker pool size has changed at the start of an
actuation. An event should always be specified as
TARGET_NUM_WORKERS_CHANGED if it reflects a change in the
The CURRENT_NUM_WORKERS_CHANGED type should be used when
actual worker pool size has been changed, but the
target_num_workers has not changed.
The ACTUATION_FAILURE type should be used when we want to
report an error to the user indicating why the current
number of workers in the pool could not be changed.
Displayed in the current status and history widgets.
Used when we want to report to the user a reason why we are
not currently adjusting the number of workers. Should
specify both target_num_workers, current_num_workers and a