config:edit --alias ipfix --factory org.opennms.features.telemetry.listeners
config:property-set name IPFIX(1)
config:property-set adapters.0.name IPFIX-Adapter(2)
config:property-set adapters.0.class-name org.opennms.netmgt.telemetry.protocols.netflow.adapter.ipfix.IpfixAdapter(3)
config:update
1 Queue name where Sentinel will fetch messages from, by default for Horizon components the queue name convention is IPFIX
2 Set a name for the IPFIX adapter
3 Assign an adapter to enrich IPFIX messages
If you want to process multiple protocols and not just one you have to increase the index 0 in the adapters name and class name accordingly for additional protocols.
The configuration is persisted with the suffix specified as alias in etc/org.opennms.features.telemetry.adapters-ipfix.cfg.
Verify adapter configuration with running the health-check
opennms:health-check
Ensure the configured flow adapters work properly
Verifying the health of the container

...
Verifying Adapter IPFIX-Adapter (org.opennms.netmgt.telemetry.protocols.netflow.adapter.ipfix.IpfixAdapter)   [ Success  ]