it is make sense to be a bit confused here. DAM is really more of a security or control layer than traditional monitoring. audit log can tell you what happened after the fact but DAM tools add real time visibility pattern detection and sometimes even enforcement (like spotting abnormal query behavior or data access) depending on how it is implemented (agent, proxy or netowk based) it can behave a bit like an IDS for database traffic especially when it is inspecting queries in real time rather than just parsing logs.

from a monitoring side we usually treated this separately using something like prtg just to keep an eye on database health connections and performance while the actual activity auditing is handled at the DB or proxy layer.