Ahh ok.

I assume this is related to unstable polling. These are all from CISCO-ENTITY-SENSOR-MIB, which is pretty heavy, and Nexus has iffy SNMP.

I'm not sure how we can work around this. It's hard to know if something is not there forever, or just for now, and storing state on that stuff is pretty messy.

Is this is a more recent thing, or has it always happened? 

Disabling faster polling modes on a device like this would probably make it unpollable.

adam.

On 2019-05-29 14:52:14, Richard Savage via observium <observium@observium.org> wrote:

Hi Adam

This is mainly seen on Cisco ASR9K's but we have also seen this on Cisco Nexus switches as well.

No this affects Voltage, Temperature, and dbm levels on SFP's

Happy to provide debug if required.




Those are a few examples.  It seems to be a mass load of sensors at any one time.

Thanks

Richard

On 29/05/2019 14:46, Adam Armstrong via observium wrote:
Hi Richard,

I assume this is because sometimes the OIDs from which the limits come aren't polled sometimes?

Is this only a single (os) device? Only a single type of sensor, or multiple? (you should now be able to see the mib/oid on the sensor page)

adam.

On 2019-05-28 10:24:00, Richard Savage via observium <observium@observium.org> wrote:

Hi All

just wonder if anyone has any ideas on this? (Mike / Adam)

Thanks

Richard

On 21/05/2019 14:50, Richard Savage via observium wrote:
Hi All

I have found a bit of a potential bug with the sensor data output which doesnt seem to be related to any particular version of Observium
or device being polled (useful I know!)

However it looks like some sensors limits are being updated to NULL regularly, which is throwing alerts and scaring staff ;-)
Noticed on both 19.3.9774 and 19.4.9840.

e.g from a device event log:

2019-05-10 12:36:07 Ethernet1/49 Lane 2 Transceiver Temperature Sensor updated (limits): limit_high -> "0", limit_high_warn -> "NULL", limit_low -> "0", limit_low_warn -> "NULL"

2019-05-10 13:08:08 Ethernet1/49 Lane 2 Transceiver Transmit Power Dbm Ethernet1/49 Lane 2 Transceiver Transmit Power above threshold: 0.03 dBm (> 0 dBm)




A re-discovery of the affected device will fix the issue, until the next time it happens.

Happy to provide any further debug required.

Thanks

Richard

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