Checking on date and return labels

[Myocptest User]

Hi,

I'm trying to setup an alertmessage if the date of the last Velero backup (velero_backup_last_successful_timestamp{schedule="daily"}) is not of today.

I've tried that with the setup below, but it seems the comparison doesn't work in the expression. I want however to have the labels returned. 

annotations:

        description: There's no completed backup today for the backupschedule '{{ $labels.schedule }}'.

        message: The last successfull backup '{{ $labels.schedule }}' is {{ $value | humanizeDuration }} old.

        summary: No backup for today

        expr: time() - velero_backup_last_successful_timestamp{schedule="daily"} > hour() * 3600 + time() * 60

Any suggestions how to set this up?

Kind regards,  Ronald