title: Azure data lake gen. 2 (adls2), api to get overall size of data stored in data lake
body: <p>I am looking for a way to get data about overall size of all data stored in data lake (azure data lake gen2 2 - adls2). Does anyone know how to obtain such information about data lake size (how much data is stored)? 
  Tried to find appropriate API but didn't find anything so far. 
  Will be thankful for any tips.</p>