Dashboard > Metrics: add color legend to the graph based on a tag

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

_No response_

### Describe the solution you'd like

In Dashboard metrics page it would be a nice feature if we can select some tag to act as a color legend for the diagram.

As it would be multiple filter set available for a metrics the user should click a button to select one of them as the legend and then the diagram should react to that.

Here's a demonstration for this button:

and then the graph would be like this:

### Additional context

we have currently color legend for histogram diagrams now