import { type MetricsCollector } from '../../observability/metrics.ts';
import type { WorkerRegistry } from '../../worker/registry.ts';
import type { TaskQueue } from '../task-queue.ts';
import { type TaskTimingFields } from '../task-state.ts';
export declare function recordTaskBacklogMetric(metricsCollector: MetricsCollector | undefined, taskQueue: TaskQueue): void;
export declare function recordTaskQueueLatencyMetric(metricsCollector: MetricsCollector | undefined, record: TaskTimingFields): void;
export declare function recordTaskExecutionLatencyMetric(metricsCollector: MetricsCollector | undefined, record: TaskTimingFields, completedAt: number): void;
export declare function recordTaskRetryMetric(metricsCollector: MetricsCollector | undefined, count?: number): void;
export declare function recordTaskRequeueMetric(metricsCollector: MetricsCollector | undefined, count?: number): void;
export declare function isTaskHeartbeatStaleForMetrics(record: TaskTimingFields & {
    deadline?: number | undefined;
}, currentTime: number, staleAfterMs?: number): boolean;
export declare function recordTaskStaleHeartbeatMetric(metricsCollector: MetricsCollector | undefined, count: number): void;
export declare function recordWorkerCapacitySaturationMetric(metricsCollector: MetricsCollector | undefined, registry: WorkerRegistry): void;