Github user ahgittin commented on the issue:
https://github.com/apache/brooklyn-server/pull/561
noticed when working on #559 . related to but not implementing ML
discussion at this time around whether `entities/xxx/activities` API should
default/optionally `includeBackground`. when listing bg tasks this gets rid of
the annoying blank ones in the list; now you see:
and clicking through you can see:
Note the addition of the `SENSOR` tag. This could be used in UI's to
filter sensor publication tasks /cc @tbouron .
Also note that if entity `child` publishes a sensor, eg in the course of
`start`, and someone else, say `parent` is subscribed to it, the event does
_not_ currently show up when you ask for `child`'s background tasks (because it
runs with the `parent` as the context entity) nor the `start` task's subtasks
(as we don't normally want to execute it as an in-queue subtask). Thus that
event will _not_ show up even if you `includeBackground` on the `start` task;
it will only show up if you query `parent` entity's tasks (with
`includeBackground` if we change the default for that endpoint as discussed on
ML). However it will still report the `child.start` as his "submitted by". If
that is a problem we should add an index on `submittedBy` for tasks so we can
properly and efficiently get `includeBackground` tasks submitted by a task even
across entity boundaries. However ATM I think it is a minor but liveable
quirk. (In any case it isn't being introduced here, it is just becoming clea
rer because other things are being clarified.)
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