Support OTEL_RESOURCE_ATTRIBUTES in the proxy #3580
Merged
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This environment variable is definted by the OpenTelemetry conventions as a way of specifying additional resource attributes to be included in traces: https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/#general-sdk-configuration
Note that this is parallel to LINKERD2_PROXY_TRACE_EXTRA_ATTRIBUTES, which is meant for common attributes that should always be provided by the proxy (pod UID, contianer name, etc.). We do not expect users to override that one, as OTEL_RESOURCE_ATTRIBUTES is the conventional way of specifying custom attributes.
Based on #3483