import type { ProjectKnowledge } from '../../types/index.js';
/**
 * Build the OTel observability section for feature/infra specs targeting backend/fullstack.
 * Emits trace propagation, metrics, and SLO criteria when OTel is installed or the project
 * has distributed patterns (external HTTP clients, queues).
 */
export declare function buildOtelHuSection(type: string, target: string, knowledge?: ProjectKnowledge | null): string[];
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