"Calculate" advanced action

When you collect numeric data from different pages (e.g. "hits" count from Kibana discover in various time ranges), you can create new variables as a computation of basic operations like calculate sum, ratio, multiplication, etc.

This is particularly useful if we want to alert on trends in time series. For example:

• Sample how many errors in the last 24h

• Sample how many errors yesterday

• See if we got a spike > 30%

• Conditional block: send alert