Clarify that attribute keys are case-sensitive (#3784)

open-telemetry · Dec 19, 2023 · 5249c34 · 5249c34
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -25,6 +25,9 @@ release.
 
 ### Common
 
+- Clarify that attribute keys are case-sensitive.
+  ([#3784](https://github.com/open-telemetry/opentelemetry-specification/pull/3784))
+
 ### Supplementary Guidelines
 
 ## v1.28.0 (2023-12-07)

diff --git a/specification/common/README.md b/specification/common/README.md
@@ -28,6 +28,7 @@ aliases: [/docs/reference/specification/common/common]
 An `Attribute` is a key-value pair, which MUST have the following properties:
 
 - The attribute key MUST be a non-`null` and non-empty string.
+  - Case sensitivity of keys is preserved. Keys that differ in casing are treated as distinct keys.
 - The attribute value is either:
   - A primitive type: string, boolean, double precision floating point (IEEE 754-1985) or signed 64 bit integer.
   - An array of primitive type values. The array MUST be homogeneous,