Derive Macro MetricsGroup

#[derive(MetricsGroup)]
{
    // Attributes available to this derive:
    #[metrics]
    #[default]
}

Derives MetricsGroup and Iterable.

This derive macro only works on structs with named fields.

It will generate a Default impl which expects all fields to be of a type that has a public new method taking a single &'static str argument. The Default::default method will call each field’s new method with the first line of the field’s doc comment as argument. Alternatively, you can override the value passed to new by setting a #[metrics(help = "my help")] attribute on the field.

It will also generate a MetricsGroup impl. By default, the struct’s name, converted to camel_case will be used as the return value of the MetricsGroup::name method. The name can be customized by setting a #[metrics(name = "my-name")] attribute.

It will also generate a Iterable impl.