MappingFieldSpec is a field spec that describes a Bloblang mapping for renaming metrics.

NewMapping parses a Bloblang mapping and returns a metrics mapping.

NewNamespaced wraps a metrics exporter and adds prefixes and custom labels.

Mapping is a compiled Bloblang mapping used to rewrite metrics.

Namespaced wraps a child metrics exporter and exposes a metrics.Type API that adds namespacing labels and name prefixes to new metrics.