If you are not offering a product built on top of Grafana as a network-available service, then there is no difference between the new license and the previous G

If you are not offering a product built on top of Grafana as a network-available service, then there is no difference between the new license and the previous GPL3 license for you whatsoever. If you are, then your obligation would change to specifically making only that work which builds on top of the Grafana code available to others for free, along with the AGPL3-licensed Grafana code. You are not required to license that code that you wrote in any way, with the caveat that others may freely use it.