PostgreSQL threshold recommendations for resources tab?

I've been using DPA with MSSQL for quite a while, but new to PostgreSQL monitoring in DPA. I can't seem to find any recommended settings for critical and warning thresholds. Anyone have a link to recommended levels?

I'd like to find one link that has them all, but any help would be appreciated. I have no idea what any of them should be for PostgreSQL.

Thanks in advance,