How to get first value of a metric if count is above a certain threshold

[श्री]

Usecase:

I am trying to get the first value of a metric if  count is above a certain threshold in order to get labels.

I am trying "expr" like :

------------------------------------------------

IF 

count(probe_success == 0) > 100

THEN

probe_success == 0 | first  

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The problem is, I am unable to get "instance" label when using count function and hence I am unable to pass it to receiver which has a mandatory condition for instance name.