Is it possible to customize a grafana panel 100%? i mean change the shape edit the colors. change its appearance (edit the css code if possible) is there any plugin that allows you to do this? what is the limit of customizing a panel ??
Generally you can only customize a panel using the features that that particular visualization allows. You could probably do whatever tweaking CSS allows by changing the CSS but I think you will still be restricted to tweaking based on the CSS classes Grafana and/or the panel uses.
For example, I use the Boom Theme plugin on some of my dashboards. You can add a “hidden” panel to a dashboard and then add custom CSS to that panel which can affect all panels on the entire dashboard.