/**
 * Computation helpers for monitor-reader.
 *
 * Pure functions that compute derived values from snapshots:
 * durations, dispatch summaries, and concurrency status.
 *
 * @module
 */
import type { MetricsSnapshot } from "../../../dispatch/persistence/metrics.ts";
import type { TaskSnapshot, DispatchSummary, ConcurrencyStatus } from "./monitor-reader-types.ts";
export declare const CONCURRENCY_GAUGE_ACTIVE = "concurrency_active";
export declare const CONCURRENCY_GAUGE_QUEUED = "concurrency_queued";
export declare const CONCURRENCY_GAUGE_LIMIT = "concurrency_limit";
export declare function computeDurationMs(startedAt: string | undefined, completedAt?: string): number;
/**
 * Compute a DispatchSummary from an array of TaskSnapshot objects.
 * Counts tasks by their status field.
 */
export declare function computeDispatchSummary(tasks: TaskSnapshot[]): DispatchSummary;
/**
 * Compute an aggregate ConcurrencyStatus from a MetricsSnapshot.
 *
 * Scans the metrics gauges for keys matching known concurrency gauge
 * patterns (concurrency_active, concurrency_queued, concurrency_limit)
 * and aggregates their values across all model keys.
 *
 * Returns a zeroed ConcurrencyStatus when no metrics or no concurrency
 * gauges are present.
 */
export declare function computeConcurrencyStatus(metrics: MetricsSnapshot | null | undefined): ConcurrencyStatus;
//# sourceMappingURL=monitor-reader-compute.d.ts.map