Can we create an alert in Grafana from 2 graphs(2 data sources) and compare the values in those graphs.
For eg: I have a parameter in 1 data source, 1 parameter in another data source, I created a graph for both of them. Can I create an alert to compare these two queries(A and B) that belong to 2 different data sources like ((A-B)=0)
Q: Can we create an alert in Grafana from 2 graphs(2 data sources)?
A: Depends. Up till Grafana version 5 you can only create alert for datasources provided by Grafana's core. e.g. Influxdb, Cloudwatch.
That is, you can't create alert for custom data sources yet.
Q: Can I compare the values from the 2 data sources? E.g. ((A-b)=0)
A: Looking at the UI for alert, I think the functionality is pretty limited at the moment. You can't do mathematical operation between queries yet. So ((A-b)=0) is not possible.
Q: Is there alternative?
A: Probably the easiest way out for you is to write your own application for it.
