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feat(metrics): add observable gauge for batch queue worker length #2848

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Merged
ericallam merged 1 commit into from
Jan 8, 2026
Merged

feat(metrics): add observable gauge for batch queue worker length #2848

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29 changes: 20 additions & 9 deletions internal-packages/run-engine/src/batch-queue/index.ts
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Original file line number Diff line number Diff line change
@@ -1,23 +1,24 @@
import { createRedisClient, type Redis, type RedisOptions } from "@internal/redis";
import { createRedisClient, type Redis } from "@internal/redis";
import {
startSpan,
type Counter,
type Histogram,
type Meter,
type ObservableGauge,
type Span,
type Tracer,
} from "@internal/tracing";
import { Logger } from "@trigger.dev/core/logger";
import {
FairQueue,
DRRScheduler,
CallbackFairQueueKeyProducer,
WorkerQueueManager,
BatchedSpanManager,
CallbackFairQueueKeyProducer,
DRRScheduler,
FairQueue,
isAbortError,
WorkerQueueManager,
type FairQueueOptions,
type StoredMessage,
} from "@trigger.dev/redis-worker";
import { Logger } from "@trigger.dev/core/logger";
import { BatchCompletionTracker } from "./completionTracker.js";
import type {
BatchCompletionCallback,
BatchItem,
Expand All @@ -29,10 +30,9 @@ import type {
ProcessBatchItemCallback,
} from "./types.js";
import { BatchItemPayload as BatchItemPayloadSchema } from "./types.js";
import { BatchCompletionTracker } from "./completionTracker.js";

export type { BatchQueueOptions, InitializeBatchOptions, CompleteBatchResult } from "./types.js";
export { BatchCompletionTracker } from "./completionTracker.js";
export type { BatchQueueOptions, CompleteBatchResult, InitializeBatchOptions } from "./types.js";

/**
* BatchQueue manages batch trigger processing with fair scheduling using
Expand Down Expand Up @@ -84,6 +84,7 @@ export class BatchQueue {
private batchCompletedCounter?: Counter;
private batchProcessingDurationHistogram?: Histogram;
private itemQueueTimeHistogram?: Histogram;
private workerQueueLengthGauge?: ObservableGauge;

constructor(private options: BatchQueueOptions) {
this.logger = options.logger ?? new Logger("BatchQueue", options.logLevel ?? "info");
Expand Down Expand Up @@ -590,6 +591,16 @@ export class BatchQueue {
description: "Time from item enqueue to processing start",
unit: "ms",
});

this.workerQueueLengthGauge = meter.createObservableGauge("batch_queue.worker_queue.length", {
description: "Number of items waiting in the batch worker queue",
unit: "items",
});

this.workerQueueLengthGauge.addCallback(async (observableResult) => {
const length = await this.workerQueueManager.getLength(BATCH_WORKER_QUEUE_ID);
observableResult.observe(length);
});
}

// ============================================================================
Expand Down