/**
 * Pure grouping of OTel span attributes by namespace (the prefix before the
 * first `.`). Keys without a dot fall into the `general` namespace. Total —
 * never throws; deterministic insertion order preserved within a group.
 */
export interface AttributeGroup {
    namespace: string;
    entries: Array<[string, unknown]>;
}
/** Group attribute entries by their dotted-key namespace, sorted by namespace name. */
export declare function groupByNamespace(attrs: Record<string, unknown>): AttributeGroup[];