/**
 * Change Failure Rate Calculator
 *
 * Calculates percentage of deployments that cause failures (DORA metric #3)
 * Data source: GitHub Issues with labels "incident" or "production-bug"
 */
import { Release, Issue, ChangeFailureRateMetric } from '../types.js';
/**
 * Calculate Change Failure Rate
 *
 * Methodology:
 * 1. Find issues labeled "incident" or "production-bug"
 * 2. Link each incident to the most recent release before it
 * 3. Calculate percentage of releases with incidents
 * 4. Classify into DORA tier
 *
 * @param releases - Array of GitHub releases
 * @param issues - Array of GitHub issues
 * @returns Change failure rate metric
 */
export declare function calculateChangeFailureRate(releases: Release[], issues: Issue[]): ChangeFailureRateMetric;
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