For a longer description of what I was doing...

I have a device that sends SNMP traps and it was sending them to my
desktop. I was monitoring snmptrapd using sudo journalctl -f -u
snmptrapd.

Originally, this provided only numeric OIDs. Installing snmp-mibs-
downloader fixed up many of the OIDs but not the custom ones.

In order to get the custom MIBS working, I had to add the directory they
were in to MIBDIRS and add -m ALL to the snmptrapd.service file (well...
I don't know if the commandline change was needed, I was following a co-
worker's suggestions). I have attached the modified snmptrapd.service
file to this bug. On my system, this file is
/etc/systemd/system/snmptrapd.service.

This is a command that works to send a trap to my local snmptrapd
(running on the same box):

MIBDIRS=/usr/share/snmp/mibs:/usr/share/snmp/mibs/iana:/usr/share/snmp/mibs/ietf:/usr/share/mibs/site:$HOME/work/git/ogtrapd/mibs
/usr/bin/snmptrap -mALL -v 2c -c log 127.0.0.1:162 "0" OG-TEST-
MIB::ogTESTMessage  ogTESTMessageStatus s 'test message'

I'll attach the custom MIBS needed to make this work too. That should
allow you to complete reproduce the issue and fix.

** Attachment added: "snmptrapd.service"
   
https://bugs.launchpad.net/ubuntu/+source/net-snmp/+bug/1847377/+attachment/5296409/+files/snmptrapd.service

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https://bugs.launchpad.net/bugs/1847377

Title:
  snmptrapd.service uses MIBSDIR instead of MIBDIRS

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