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Clarify resource_attributes_as_tags behavior #33593

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Clarify resource_attributes_as_tags behavior #33593

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10 changes: 8 additions & 2 deletions content/en/opentelemetry/mapping/semantic_mapping.md
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Expand Up @@ -108,7 +108,7 @@
- opentelemetry_convention: '`app.kubernetes.io/version`'
datadog_convention: '`kube_app_version`'
type: Kubernetes labels
- opentelemetry_convention: '`app.kuberenetes.io/component`'
- opentelemetry_convention: '`app.kubernetes.io/component`'
datadog_convention: '`kube_app_component`'
type: Kubernetes labels
- opentelemetry_convention: '`app.kubernetes.io/part-of`'
Expand Down Expand Up @@ -243,7 +243,12 @@

## Metrics attribute mapping

For metrics, by default, Datadog only maps the OpenTelemetry resource attributes listed in the previous sections to Datadog metric tags. To map all resource attributes to tags, enable the `metrics::resource_attributes_as_tags` setting:
By default, Datadog maps only the OpenTelemetry resource attributes listed in the semantic conventions table above to Datadog metric tags.

To attach all resource attributes from your OTLP metric payloads as tags, enable the `metrics::resource_attributes_as_tags` setting:

Check notice on line 248 in content/en/opentelemetry/mapping/semantic_mapping.md

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Datadog.sentencelength 

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When enabled, this setting adds all resource attribute key/value pairs as Datadog tags, in addition to the mapped semantic convention tags shown in the table above.

**Note**: Enabling this option may significantly increase tag cardinality. To verify which tags are being added, inspect your metrics in the [Metrics Explorer][12].

{{< tabs >}}
{{% tab "Datadog exporter" %}}
Expand Down Expand Up @@ -289,3 +294,4 @@
[9]: https://opentelemetry.io/docs/specs/semconv/attributes-registry/db/#db-system
[10]: #mapping-opentelemetry-database-system-type-to-datadog-span-type
[11]: /opentelemetry/schema_semantics/hostname#cloud-provider-specific-conventions
[12]: https://app.datadoghq.com/metric/explorer
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