Introduce specification for OTel Profiles

Signed-off-by: Florian Lehner <florian.lehner@elastic.co>

CHANGELOG.md

@@ -24,6 +24,10 @@ release.
 
 ### Resource
 
+### Profiles
+
+- Define required attributes for Mappings.
+
 ### OpenTelemetry Protocol
 
 ### Compatibility

specification/profiles/mappings.md

@@ -0,0 +1,21 @@
+# Mappings
+
+**Status**: [Development](../document-status.md), except where otherwise specified
+
+This document defines how to record `Mapping`s and their required attributes.
+
+<!-- toc -->
+
+- [Attributes](#attributes)
+
+<!-- tocstop -->
+
+## Attributes
+
+A message representing a `Mapping` MUST have at least one of the following
+attributes:
+
+- `process.executable.build_id.go`
+- `process.executable.build_id.gnu`
+
+If possible all the above listed attributes SHOULD be present in a `Mapping`.