At the bottom of the topology page, you can find “Show System Stats” button. 
Click on it and you will see __acker.

Best,
Ethan

> On Jul 19, 2018, at 11:04 AM, Alessio Pagliari <[email protected]> wrote:
> 
> Hello everybody,
> 
> I cannot find a way to show in the UI or retrieve through REST APIs the 
> placement of the acker executors. Is there a way to get this information? I 
> remember that in some topologies in the past I was able to see them in the UI 
> with the name ‘__acker’, but now I can’t understand how to display them again.
> 
> Thank you,
> 
> Alessio
> 

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