Alert on changes

Hello,
i have 1 index which is filled once a day with some values.
I have to create an alert only if a value is added which was not present in the day before.

how to archive this? any ideas?
thanks

Hi @ksremo ,

Can you provide some more details about your data? Is the "value" an actual value to an assigned key? Or a key itself? Maybe list an example of a structure on day 1 and one on day 2 that should fire this alert.