To expand on that, you have to offer to provide the source to "all users interacting with it remotely through a computer network". If you're using Grafana for monitoring your SaaSS app, then your users aren't interacting with Grafana, so you're fine.
If your SaaSS app surfaces a few small things from Grafana to the user, do you only have to open source the glue code, or the entire SaaSS application?
The entire application, to the extent that it's a single work under copyright law. If your app is a "mere aggregation" of e.g. grafana administration and other-service-administration components then maybe not.
