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Clarify that attribute keys are case-sensitive #3784

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3 changes: 3 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -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)
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1 change: 1 addition & 0 deletions specification/common/README.md
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Expand Up @@ -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.
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- An array of primitive type values. The array MUST be homogeneous,
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