It would be useful to be able to graph and alert on dropped packets for each interfaces.
See https://kb.juniper.net/InfoCenter/index?page=content&id=KB20666 for the Juniper SNMP OIDs to query.
And some real device example:
> show snmp mib walk ifDescr | grep ge-2/0/11
ifDescr.982 = ge-2/0/11
> show snmp mib walk 1.3.6.1.4.1.2636.3.15.2.1.2
jnxCosFcQueueNr.11.98.101.115.116.45.101.102.102.111.114.116 = 0
jnxCosFcQueueNr.15.110.101.116.119.111.114.107.45.99.111.110.116.114.111.108 = 7
jnxCosFcQueueNr.18.97.115.115.117.114.101.100.45.102.111.114.119.97.114.100.105.110.103 = 1
jnxCosFcQueueNr.20.101.120.112.101.100.105.116.101.100.45.102.111.114.119.97.114.100.105.110.103 = 5
> show snmp mib walk jnxCosIfqTailDropPkts | grep 982
jnxCosIfqTailDropPkts.982.11.98.101.115.116.45.101.102.102.111.114.116 = 129223296
jnxCosIfqTailDropPkts.982.15.110.101.116.119.111.114.107.45.99.111.110.116.114.111.108 = 2
jnxCosIfqTailDropPkts.982.18.97.115.115.117.114.101.100.45.102.111.114.119.97.114.100.105.110.103 = 0
jnxCosIfqTailDropPkts.982.20.101.120.112.101.100.105.116.101.100.45.102.111.114.119.97.114.100.105.110.103 = 0