How can I use snmpwalk to determine what I'm able to monitor via SNMP on a device?

Let me preface this by saying I'm familiar with SNMP only in theory. This is my first time working with SNMP. I'm trying to determine what variables can be monitored using SNMP on a Dell EMC ML3 Tape Library. My job uses icinga2 for monitoring hosts, with SNMP plugins enabled for certain hosts. I'm performing the snmpwalk from our icinga2 server running CentOS 7.This tape library is a new device and we don't know what can be monitored on it. I've ran the following commands (as outlined in documentation I found from the employee previously working on this):

snmpwalk -v2c -c 1c1ng@2 -O -e 10.100.19.11

snmpwalk -v2c -c 1c1ng@2 10.100.19.11

The output was the same for both commands and is shown in this screenshot: This output doesn't seem to show any variables we would be interested in, such as interfaces, temperatures, etc. My question is, how do I find the OIDs so I can determine what SNMP can monitor on this host? Am I missing something?