Which file contains the list of events for which the GTM System will send traps to an SNMP manager?

/etc/snmpd.conf configures the SNMP daemon itself - defining community strings, allowed managers, and MIB settings - but does not define which events generate traps.

/etc/syslog-ng.conf configures the syslog-ng logging daemon for log routing and filtering, and is unrelated to SNMP trap event definitions.

The alertd daemon on BIG-IP/GTM systems reads /etc/alertd/alert.conf to determine which events generate SNMP traps sent to configured SNMP managers. Each entry in alert.conf maps a specific syslog message pattern to one or more actions, including the snmptrap action that transmits trap data to the SNMP manager. This file is the authoritative source for customizing which events produce SNMP notifications.

/etc/gtm_snmptrap.conf is not the standard BIG-IP file for defining trap events; trap event configuration resides in alert.conf managed by the alertd daemon.