The table S_QOS_SNAPSHOT is not being updated with current values.
In the data_engine log I can see the following error, where (username) is the username configured in data_engine (e.g. the Oracle tablespace username):
Release : 20.3
missing permissions on Oracle DB
The following grant should resolve this issue:
grant select on v$session to (username);
In some cases we have seen where upgrading Oracle 12 to 12.2 has caused this grant to be dropped for unknown reasons.