/**
 * WorkflowMetricsCollector - Metrics collection for workflow execution
 *
 * Features:
 * - Counters for executions, successes, failures
 * - Histograms for latency distribution
 * - Gauges for active workflows, queue depth
 * - Per-node and per-workflow metrics
 * - Token and cost tracking
 * - Prometheus-compatible output
 */
import type { MetricsConfig, WorkflowMetrics } from '@cogitator-ai/types';
/**
 * WorkflowMetricsCollector - Main metrics collection class
 */
export declare class WorkflowMetricsCollector {
    private config;
    private counters;
    private gauges;
    private histograms;
    private latencySamples;
    private nodeMetrics;
    private tokenUsage;
    private costTracking;
    private lastUpdated;
    constructor(config?: Partial<MetricsConfig>);
    /**
     * Get prefixed metric name
     */
    private metricName;
    recordWorkflowStart(workflowName: string, labels?: Record<string, string>): void;
    recordWorkflowComplete(workflowName: string, durationMs: number, status: 'success' | 'failure' | 'cancelled', labels?: Record<string, string>): void;
    recordNodeExecution(workflowName: string, nodeName: string, nodeType: string, durationMs: number, success: boolean, retries?: number): void;
    recordTokenUsage(workflowName: string, inputTokens: number, outputTokens: number): void;
    recordCost(workflowName: string, cost: number): void;
    /**
     * Get workflow metrics summary
     */
    getWorkflowMetrics(workflowName: string): WorkflowMetrics | null;
    /**
     * Increment counter
     */
    private incrementCounter;
    /**
     * Set gauge value
     */
    private setGauge;
    /**
     * Increment gauge
     */
    private incrementGauge;
    /**
     * Decrement gauge
     */
    private decrementGauge;
    /**
     * Record histogram value
     */
    private recordHistogram;
    /**
     * Record latency sample for percentile calculations
     */
    private recordLatencySample;
    /**
     * Get appropriate buckets for a metric
     */
    private getBucketsForMetric;
    /**
     * Build labeled key for maps
     */
    private labeledKey;
    /**
     * Export metrics in Prometheus text format
     */
    toPrometheusFormat(): string;
    private formatPrometheusLabels;
    private parseLabels;
    /**
     * Reset all metrics
     */
    reset(): void;
    /**
     * Get all workflow names with metrics
     */
    getWorkflowNames(): string[];
}
/**
 * Create a metrics collector instance
 */
export declare function createMetricsCollector(config?: Partial<MetricsConfig>): WorkflowMetricsCollector;
export declare function getGlobalMetrics(): WorkflowMetricsCollector;
export declare function setGlobalMetrics(metrics: WorkflowMetricsCollector): void;
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