One of the feature I find myself keep going back to HD+ for is the ability to bring up a devices Activity/History.
Would be awesome to have a Action added that is able to view the Activity/History that we could assign to one of the Tile Actions [‘Tap’, ‘Dbl Tap’, ‘Hold’]
Where do you think this activity is being kept?
I suspect it is fairly inaccurate - because if there is any time that the HD+ app isn’t running, it would be blind to any past events.
Do you know if this limitation is known / discussed?? And if true, is it really valid or worth having?
I’d actually point you to the HE hub as being the best place to review event history - and unfortunately I don’t believe this is made available externally
Its definitely getting it from the HE Hub itself. I just closed the app and put my phone into airplane mode. Then went and turned a light on/off, removed my phone from airplane mode and was able to see the on/off activation in the activity log in HD+
Just had a look at Maker API and the event history for a device is accessible using the following:
Get Device Event History (replace [Device ID] with actual subscribed device id
http://10.x.x.x/apps/api/102/devices/[Device ID]/events?access_token=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
That’s correct. Maker dishes it out, just needs formating on the HV side.
Well there you go. I must admit I didn’t realise there was that event history pushed out by MakerAPI.
You learn something new every day 
Vote for it and it will happen.
It’s all right there on the Docs page for Maker API:
What do you use it for? Why do you want to know a devices history?
I know some use History to see how often a particular motion detector or alarm system tripped, but I find it helpful to diagnose whether a particular trigger or command is being processed on devices that otherwise have no outward response (e.g. TV volume, which fires an RM rule; or virtual switch; or hub variable values set by another rule, etc.).