in packages/opentelemetry-cloud-trace-exporter/src/transform.ts [189:200]
function mergeAttributes(...attributeList: Attributes[]): Attributes {
const attributesOut = {
attributeMap: {},
droppedAttributesCount: 0,
};
attributeList.forEach(attributes => {
Object.assign(attributesOut.attributeMap, attributes.attributeMap);
attributesOut.droppedAttributesCount +=
attributes.droppedAttributesCount ?? 0;
});
return attributesOut;
}