Use ifInErrors_delta or ifInErrors_rate to monitor layer 1 issues

[Mats_Igeskog]

Hi community,
Im trying to understand which of these parameter to use to find layer 1 issues / crc errors on a netvisor pluribus device. The device never shows any data for the rate parameter but the delta parameter increases and decreases.

I have written the below alert rule but it never seems to trigger properly.

Am i thinking about this correctly? Does it even make sense to use the delta parameter to find layer 1 / crc issues? I think the attached errors (second pic) should have triggered an alert but it does not seem to happen.

+------------------+
| ifInErrors_delta |
+------------------+
|               31 |
+------------------+
+-----------------+
| ifInErrors_rate |
+-----------------+
|               0 |
+-----------------+

[murrant]

I think rate is an integer so the amount of errors per second is less than 0.5 (which checks out for the math) and it is rounded down to 0