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Clarify distinction between map<string, AnyValue> and Attribute Collections #4727

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Clarify distinction between map<string, AnyValue> and Attribute Collections #4727

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larify distinction between map<string, AnyValue> and Attribute Collec…
pellared Nov 7, 2025
71a1b71
Update specification/common/README.md
pellared Nov 7, 2025
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Update specification/common/README.md
pellared Nov 7, 2025
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6 changes: 6 additions & 0 deletions specification/common/README.md
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Expand Up @@ -122,6 +122,12 @@ outside OpenTelemetry into OpenTelemetry attribute values.
[Log Records](../logs/data-model.md),
contain a collection of attributes.

Attribute Collections are top-level collections of key-value pairs used in
OpenTelemetry data models.
Note that they are distinct from [`map<string, AnyValue>`](#mapstring-anyvalue),
which is a type of [`AnyValue`](#anyvalue) used to represent nested data
structures e.g. in attribute values and [log record body](../logs/data-model.md#field-body).

Implementation MUST by default ensure that the exported attribute collections
contain only unique keys. The enforcement of uniqueness may be performed
in a variety of ways as it best fits the limitations of the particular
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