ssh+ppk discovery

Hello,

Newb here. Just finished installing NPM & SAM.

Question about Discovery.

We have lots of Linux machines but we're not using SAMBA or any other common user authentication database.

We do however use PPK's with certain root level accounts.

Is there a way to configure a discovery to use one of these accounts? I couldn't find a way to install the PPK

or associate it with credentials in Discovery Central.

Thanks in advance,

Ed