Is it possible to overlay 2 graphs?

[daniellee]

Yes, it is.

This is an 8.2 example with the new Time Series panel which supports more than 2 y-axis: Grafana

I guess you are using the old Graph panel and here are the docs for multiple y-axes:

• Learn Grafana: How to use dual axis graphs | Grafana Labs
• Graph (old) | Grafana Labs
• For older versions: Advanced Graphing (Part3): Right Y-axis & Log scales