Problem:

The calculated item "Tablespace allocate percent" gives wrong values

key:  oracle.ts.stats["\{$ORACLE.CONNSTRING}","\{$ORACLE.USER}","\{$ORACLE.PASSWORD}","\{$ORACLE.SERVICE}"] 

Example (tbs USERS):  {"USERS":{"contents":"PERMANENT","file_bytes":18477219840,"max_bytes":34359721984,"free_bytes":880738304,"used_bytes":17596481536,"used_pct_max":53.78,"used_file_pct":95.23,"status":1}}

Making a query on the view used by Zabbix for getting data the "free_bytes" value  is very different from real value.