export declare const METRICS_NAMESPACE = "ApparelHub/MCP";
/** Bucket an HTTP status into a coarse outcome dimension (bounded cardinality). */
export declare function outcomeForStatus(status: number): string;
/** Extract the JSON-RPC method and (for `tools/call`) the tool name from a request body.
 *  Best-effort + safe: any parse failure returns {} so metrics never break a request. */
export declare function parseRpc(body: string | undefined, isBase64: boolean): {
    rpcMethod?: string;
    toolName?: string;
};
export interface ConnectorMetric {
    outcome: string;
    latencyMs: number;
    toolName?: string;
    /** Injectable for tests (defaults to Date.now()). */
    now?: number;
    /** Injectable for tests (defaults to console.log). */
    emit?: (line: string) => void;
}
/** Build the EMF payload for a request: `Requests` (Count) + `LatencyMs` (Milliseconds),
 *  emitted per `Outcome` and (for tool calls) per `ToolName`. Exposed for tests. */
export declare function buildEmf(m: ConnectorMetric): Record<string, unknown>;
/** Emit one EMF metric line (fire-and-forget; never throws into the request path). */
export declare function emitConnectorMetric(m: ConnectorMetric): void;