Function with_role 

fn with_role(
    opts: MakeCollectorOpts,
    role: ComputeRuntimeRole,
) -> MakeCollectorOpts

Applies the per-role const label to opts, unless role is Solo.

The two named roles (maintenance, interactive) each get a distinct role label so a second compute runtime in the same process registers a distinct series rather than colliding with the first. Solo omits the label so a single-runtime deployment registers exactly as it did before a second runtime existed.