chore: introduce metrics interface in change doc

Author: josecorella

changes/2025-09-12_introduce-metrics-interface/background.md

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+[//]: # "Copyright Amazon.com Inc. or its affiliates. All Rights Reserved."
+[//]: # "SPDX-License-Identifier: CC-BY-SA-4.0"
+
+# Interacting with a Metrics Interface in the AWS Encryption SDK family of products (Background)
+
+## Definitions
+
+### Conventions used in this document
+
+The key words
+"MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
+"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL"
+in this document are to be interpreted as described in
+[RFC 2119](https://tools.ietf.org/html/rfc2119).
+
+## Issues and Alternatives
+
+###  collecting metrics from customers?
+
+Crypto Tools (CT) publishes software libraries. The latest
+versions of these libraries have no logging or metrics publishing
+to either a local application or to an observability service like AWS CloudWatch.
+
+
+
+
+### Why should supported libraries collect metrics?
+
+Metrics collection has long been an outstanding feature request
+that has been 
+
+### Default Behavior?
+
+
+### Should Data Plane APIs fail if metrics fail to publish?
+
+