Hi Martian,

 please make discovery debug for an device:
./discovery.php -d -h <device>

but most likely the problem will be solved with this (reset mib indexes):
https://docs.observium.org/faq/#all-my-hosts-seem-down-to-observium-snmp-doesnt-seem-to-work-anymore

Marian Rychtecky via observium wrote on 31.08.2020 14:54:
Hi Mike and all,
    today I upgraded Observium to the latest stable version 20.8.10645. After the upgrade system deleted sensors PSUs, CPUs and FANs on ALL Nexus switches. Please note there was no change on devices nor network, I just performed svn update on Observium.



Thank you Marian

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Marian Rychtecký
Phone +420 724 397 441
 
NIX.CZ z.s.p.o.
Americká 23, Praha 2
130 52 Czech Republic



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Mike Stupalov
Observium Limited, http://observium.org