The interesting part is:
/usr/bin/snmpbulkwalk -t '5' -r '2' -v2c -c '<private>' -Pu -OQUs -m EtherLike-MIB -M /opt/observium/mibs/rfc:/opt/observium/mibs/net-snmp 'udp':'<hostname>':'161' dot3StatsEntry
[...]
dot3StatsDuplexStatus.508 = fullDuplex
dot3StatsDuplexStatus.509 = fullDuplex
dot3StatsDuplexStatus.510 = fullDuplex
dot3StatsDuplexStatus.511 = fullDuplex
dot3StatsDuplexStatus.513 = fullDuplex
dot3StatsDuplexStatus.514 = fullDuplex
dot3StatsDuplexStatus.515 = fullDuplex
dot3StatsDuplexStatus.516 = fullDuplex
dot3StatsDuplexStatus.517 = fullDuplex
dot3StatsDuplexStatus.519 = fullDuplex
dot3StatsDuplexStatus.523 = fullDuplex
dot3StatsDuplexStatus.526 = fullDuplex
dot3StatsDuplexStatus.528 = fullDuplex
dot3StatsDuplexStatus.529 = fullDuplex
[..]
Do you see any possibility to circumvent the bug?
(Meanwhile I will open a case @Juniper, but I assume they are as big as a giant tanker. Mostly you need a speedboat for making customers happy)
Access to a device can be provided.
Vendor bug.