If your product is integrated closely enough with grafana to constitute a derivative work under copyright law, yes. That's a complicated and murky area of law, but it's unlikely that just iframing in an otherwise separate webapp as a metrics page would be enough to trigger it.

(Whereas if you integrate e.g. editing metrics and calling grafana's API to add them to a dashboard, at that point it seems far more likely your system would be considered a derivative of grafana - but at that point you really are implementing a grafana editor product (or at least a product that includes a grafana editor) rather than just using grafana to monitor a separate product).