In Microsoft Exchange Server 2019 or Exchange Server 2016, ETL files under %ExchangeInstallPath%Logging\Query consume lots of disk space. After you apply this update, the most of the irrelevant logs won't be generated.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
To fix this issue, install one of the following updates:For Exchange Server 2019, install the Cumulative Update 1 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.
For Exchange Server 2016, install the Cumulative Update 12 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.
Learn about the terminology that Microsoft uses to describe software updates.