How to monitor oracle database using zabbix agent2

rpm -Uvh https://repo.zabbix.com/zabbix/5.0/rhel/7/x86_64/zabbix-release-5.0-1.el7.noarch.rpm
yum insall -y zabbix-agent2

rpm -ivh https://download.oracle.com/otn_software/linux/instantclient/211000/oracle-instantclient-basic-21.1.0.0.0-1.x86_64.rpm

ORACLE_HOME=/usr/lib/oracle/21/client64;export ORACLE_HOME
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/usr/lib64:$LD_LIBRARY_PATH;export LD_LIBRARY_PATH

CREATE USER zabbix_mon IDENTIFIED BY zabbix_pass;
-- Grant access to the zabbix_mon user.
GRANT CONNECT, CREATE SESSION TO zabbix_mon;
GRANT SELECT ON DBA_TABLESPACE_USAGE_METRICS TO zabbix_mon;
GRANT SELECT ON DBA_TABLESPACES TO zabbix_mon;
GRANT SELECT ON DBA_USERS TO zabbix_mon;
GRANT SELECT ON DBA_DATA_FILES TO zabbix_mon;
GRANT SELECT ON DBA_FREE_SPACE TO zabbix_mon;
GRANT SELECT ON DBA_TEMP_FILES to zabbix_mon;
GRANT SELECT ON GV_$SORT_SEGMENT to zabbix_mon;
GRANT SELECT ON V_$ACTIVE_SESSION_HISTORY TO zabbix_mon;
GRANT SELECT ON V_$ARCHIVE_DEST TO zabbix_mon;
GRANT SELECT ON V_$ASM_DISKGROUP TO zabbix_mon;
GRANT SELECT ON V_$DATABASE TO zabbix_mon;
GRANT SELECT ON V_$DATAFILE TO zabbix_mon;
GRANT SELECT ON V_$INSTANCE TO zabbix_mon;
GRANT SELECT ON V_$LOG TO zabbix_mon;
GRANT SELECT ON V_$OSSTAT TO zabbix_mon;
GRANT SELECT ON V_$PGASTAT TO zabbix_mon;
GRANT SELECT ON V_$PARAMETER TO zabbix_mon;
GRANT SELECT ON V_$PROCESS TO zabbix_mon;
GRANT SELECT ON V_$RECOVERY_FILE_DEST TO zabbix_mon;
GRANT SELECT ON V_$RESTORE_POINT TO zabbix_mon;
GRANT SELECT ON V_$RESTORE_POINT TO zabbix_mon;
GRANT SELECT ON V_$SESSION TO zabbix_mon;
GRANT SELECT ON V_$SGASTAT TO zabbix_mon;
GRANT SELECT ON V_$SYSMETRIC TO zabbix_mon;
GRANT SELECT ON V_$SYSTEM_PARAMETER TO zabbix_mon;
GRANT SELECT ON V_$PDBS TO zabbix_mon;
GRANT SELECT ON V_$SYSTEM_PARAMETER to zabbix_mon;

[root@vcenter zabbix_agent2.d]# cat monitor_oracle.conf 
Plugins.Oracle.Sessions.demo.Uri=tcp://172.20.20.150:1521
Plugins.Oracle.Sessions.demo.User=zabbix_mon
Plugins.Oracle.Sessions.demo.Password=zabbix_pass
Plugins.Oracle.Sessions.demo.Service=demopdb