/**
 * Metric catalogue for Weft observability.
 *
 * @module metrics-catalog
 */
/**
 * Metric names and descriptions for Weft observability.
 *
 * @example
 * ```ts
 * import { METRICS } from '@lostgradient/weft/observability';
 *
 * for (const metric of Object.values(METRICS)) {
 *   console.log(metric.name, metric.type, metric.unit);
 * }
 * // e.g. 'weft.workflow.duration' 'histogram' 'ms'
 * ```
 */
export declare const METRICS: {
    readonly workflowDuration: {
        readonly name: "weft.workflow.duration";
        readonly description: "Duration of workflow execution in milliseconds";
        readonly unit: "ms";
        readonly type: "histogram";
    };
    readonly activityDuration: {
        readonly name: "weft.activity.duration";
        readonly description: "Duration of activity execution in milliseconds";
        readonly unit: "ms";
        readonly type: "histogram";
    };
    readonly activityAttempts: {
        readonly name: "weft.activity.attempts";
        readonly description: "Total activity execution attempts";
        readonly unit: "attempts";
        readonly type: "counter";
    };
    readonly workflowActive: {
        readonly name: "weft.workflow.active";
        readonly description: "Number of currently active workflows";
        readonly unit: "workflows";
        readonly type: "gauge";
    };
    readonly workflowStarted: {
        readonly name: "weft.workflow.started";
        readonly description: "Total workflows started";
        readonly unit: "workflows";
        readonly type: "counter";
    };
    readonly workflowCompleted: {
        readonly name: "weft.workflow.completed";
        readonly description: "Total workflows completed";
        readonly unit: "workflows";
        readonly type: "counter";
    };
    readonly workflowFailed: {
        readonly name: "weft.workflow.failed";
        readonly description: "Total workflows failed";
        readonly unit: "workflows";
        readonly type: "counter";
    };
    readonly promptCacheHits: {
        readonly name: "weft.prompt_cache.hits";
        readonly description: "Total prompt prefix cache hits";
        readonly unit: "hits";
        readonly type: "counter";
    };
    readonly promptCacheMisses: {
        readonly name: "weft.prompt_cache.misses";
        readonly description: "Total prompt prefix cache misses";
        readonly unit: "misses";
        readonly type: "counter";
    };
    readonly dpmoDefects: {
        readonly name: "weft.dpmo.defects";
        readonly description: "Total failed workflows (DPMO numerator)";
        readonly unit: "workflows";
        readonly type: "counter";
    };
    readonly dpmoOperations: {
        readonly name: "weft.dpmo.operations";
        readonly description: "Total started workflows (DPMO denominator)";
        readonly unit: "workflows";
        readonly type: "counter";
    };
    readonly taskBacklog: {
        readonly name: "weft.task.backlog";
        readonly description: "Number of queued tasks waiting for workers";
        readonly unit: "tasks";
        readonly type: "gauge";
    };
    readonly taskQueueLatency: {
        readonly name: "weft.task.queue_latency";
        readonly description: "Time tasks spend queued before dispatch in milliseconds";
        readonly unit: "ms";
        readonly type: "histogram";
    };
    readonly taskExecutionLatency: {
        readonly name: "weft.task.execution_latency";
        readonly description: "Time tasks spend executing after worker start in milliseconds";
        readonly unit: "ms";
        readonly type: "histogram";
    };
    readonly taskRetries: {
        readonly name: "weft.task.retries";
        readonly description: "Total task retry attempts after the first dispatch attempt";
        readonly unit: "retries";
        readonly type: "counter";
    };
    readonly taskRequeues: {
        readonly name: "weft.task.requeues";
        readonly description: "Total visibility-timeout or disconnect task requeues";
        readonly unit: "requeues";
        readonly type: "counter";
    };
    readonly taskStaleHeartbeats: {
        readonly name: "weft.task.stale_heartbeats";
        readonly description: "Number of in-flight tasks whose heartbeat age exceeds the diagnostic threshold";
        readonly unit: "tasks";
        readonly type: "gauge";
    };
    readonly workerCapacitySaturation: {
        readonly name: "weft.worker.capacity_saturation";
        readonly description: "Ratio of in-flight worker slots to total worker concurrency";
        readonly unit: "ratio";
        readonly type: "gauge";
    };
};