/**
 * MCP get_metrics tool (v2.16)
 *
 * Returns observability metrics as JSON. Categories:
 * - summary: counters + histograms + gauges
 * - slow_queries: recent slow queries (ring buffered)
 * - all: everything (counters + histograms + gauges + rings)
 */
export interface GetMetricsConfig {
    enabled: boolean;
}
export declare const GET_METRICS_TOOL_DESCRIPTION = "Get server observability metrics. category=summary|slow_queries|all. Returns JSON.";
export type MetricsCategory = 'summary' | 'slow_queries' | 'all' | 'multi_db';
export interface MetricsResponse {
    counters?: Array<{
        name: string;
        help: string;
        series: Array<{
            labels: Record<string, string>;
            value: number;
        }>;
    }>;
    histograms?: Array<{
        name: string;
        help: string;
        series: Array<{
            labels: Record<string, string>;
            count: number;
            sum: number;
            cumulativeCounts: number[];
        }>;
    }>;
    gauges?: Array<{
        name: string;
        help: string;
        series: Array<{
            labels: Record<string, string>;
            value: number;
        }>;
    }>;
    slow_queries?: Array<{
        ts: string;
        db: string;
        kind: string;
        seconds: number;
        sql: string;
        error: string | null;
    }>;
    rings?: Array<{
        name: string;
        size: number;
        capacity: number;
        items: unknown[];
    }>;
}
export declare function buildGetMetricsHandler(cfg: GetMetricsConfig, multiDbProvider?: () => unknown): (args: {
    category?: MetricsCategory;
}) => Promise<MetricsResponse>;
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