Help please; need to generate trap when ipv4indrops are more than 50%

[techy21]

Hello,

I am new to pfsense firewall. Though I was able to configure snmp settings on the pfsense firewall, I could  not configure
snmp trap from pfsense firewall based on the number packets being dropped. Where is the snmpd conf file ? /etc/snmpd.conf seems to be different.
Though I was able to poll and get the statistics, I guess getting a trap for critical events would make sysadmin
life easy . Please refer attached file.

Hope somebody ventured into this path and help me ,,,thanks for your time.

warm regards,

Bhaanu