/**
 * log10x_discover_join — auto-discover the join label between Log10x
 * pattern metrics and the customer metric backend via Jaccard similarity
 * on label value sets.
 *
 * This tool runs the Jaccard pass across every candidate label pair and
 * returns the best match above the 0.7 floor, plus runner-ups above 0.5.
 *
 * Cached per-session per (environment, customer-backend-endpoint) so
 * the cross-pillar primitives (metrics_that_moved, rank_by_shape_similarity,
 * metric_overlay) can auto-call this once at the start of a session and
 * never re-probe.
 *
 * Agents should normally NOT need to call this tool directly — the
 * cross-pillar primitives run it internally via the session cache.
 * The explicit tool exists for power users who want to inspect the join
 * universe before correlating, or to force a re-discovery.
 *
 * Tier prerequisites: LOG10X_CUSTOMER_METRICS_URL configured.
 * This tool issues up to ~12 PromQL queries (6 Log10x-side label value
 * fetches + 6 customer-side). Results are cached per session.
 */
import { z } from 'zod';
import type { EnvConfig } from '../lib/environments.js';
import { type StructuredOutput } from '../lib/output-types.js';
export declare const discoverJoinSchema: {
    force_refresh: z.ZodDefault<z.ZodBoolean>;
    minimum_jaccard: z.ZodDefault<z.ZodNumber>;
    candidate_labels: z.ZodOptional<z.ZodArray<z.ZodString, "many">>;
    window: z.ZodOptional<z.ZodString>;
    timeRange: z.ZodOptional<z.ZodString>;
    environment: z.ZodOptional<z.ZodString>;
    customer_metrics_url: z.ZodOptional<z.ZodString>;
    customer_metrics_type: z.ZodOptional<z.ZodEnum<["grafana_cloud", "amp", "datadog_prom", "generic_prom", "log10x"]>>;
    customer_metrics_auth: z.ZodOptional<z.ZodString>;
};
export declare function executeDiscoverJoin(args: {
    force_refresh?: boolean;
    minimum_jaccard?: number;
    candidate_labels?: string[];
    window?: string;
    timeRange?: string;
    environment?: string;
    customer_metrics_url?: string;
    customer_metrics_type?: string;
    customer_metrics_auth?: string;
}, env: EnvConfig): Promise<string | StructuredOutput>;