Okay.. if we try to do the workaround with recording rule.. please tell me 
how in this case..

just to get the latest know values from this blog (
https://roidelapluie.be./blog/2019/02/21/prometheus-last/)

only this one is enough .. right ?

- record: available_sms_last expr: available_sms or available_sms_last

where available_sms is the actual metric 

so my case I only have to add : 

groups:
- name: test-rules rules: - expr: failure_count or failure_count_last 
record: failure_count_last
  - alert: failure_count_last_alert
               expr: failure_count_last_alert > 0

On Monday, 15 June 2020 13:48:23 UTC+5:30, Baitanik Talukder wrote:
>
> I need the last value in a range vector.
> Something like 
>
> *last_value*(failure_count{job="xyz"}[5d])
>
> it is need for the following scenrio:
> for last 4 days there was no failure_count metric pushed.. so last value 
> we have 5 days back.
> output of 
> failure_count{job="xyz"}[5d]
>
> I need the last value (5) from here.
>
> failure_count{endpoint="http",job="xyz"} 8 @1591776884.502
> [email protected]
> 9 @1591776944.502
> 5 @1591776974.502
>
>

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