BullMQ

This guide covers how to instrument BullMQ queues and workers. You will learn how to:

Install and configure the instrumentation
Track job dispatch and processing
Understand producer and consumer spans

For the full list of required span attributes and what powers the Jobs dashboard, see the Jobs feature page.

Installation

npm install @monocle.sh/instrumentation-bullmq

Peer dependency: bullmq >= 5.0.0

Usage

Create an instance of BullMQInstrumentation and call enable(). This must happen before you import or create any BullMQ Queue, Worker, or FlowProducer instances.

instrumentation.ts

import { BullMQInstrumentation } from "@monocle.sh/instrumentation-bullmq";

const instrumentation = new BullMQInstrumentation();
instrumentation.enable();

Once enabled, all Queue.add, Queue.addBulk, FlowProducer.add, FlowProducer.addBulk, and Worker processing calls are automatically instrumented.

example.ts

import { Queue, Worker } from "bullmq";

const queue = new Queue("emails", { connection });

// This creates a PRODUCER span
await queue.add("welcome-email", { userId: "123" });

// This creates a CONSUMER span for each processed job
const worker = new Worker("emails", async (job) => {
  await sendEmail(job.data.userId);
}, { connection });

Configuration

const instrumentation = new BullMQInstrumentation({
  // Create individual spans for each job in addBulk (default: true)
  emitCreateSpansForBulk: true,

  // Create individual spans for each job in FlowProducer.add (default: true)
  emitCreateSpansForFlow: true,

  // Only create producer spans when a parent span exists (default: false)
  requireParentSpanForPublish: false,

  // Use producer span as consumer parent instead of linking (default: false)
  useProducerSpanAsConsumerParent: false,
});

Span linking vs parenting

By default, consumer spans are linked to the producer span. This means they appear as separate traces connected by a link. Set useProducerSpanAsConsumerParent: true to make the consumer span a child of the producer, keeping them in the same trace.

Spans

Producer spans

Queue.add creates a PRODUCER span named Queue.add {queueName}. Queue.addBulk creates an INTERNAL parent span named Queue.addBulk {queueName}, with individual PRODUCER child spans for each job (named Job.addJob {queueName}). FlowProducer.add creates an INTERNAL parent span named FlowProducer.add {queueName}, with child spans for each job in the flow tree. FlowProducer.addBulk creates an INTERNAL parent span named FlowProducer.addBulk, with child spans per flow.

Consumer spans

Worker processing creates a CONSUMER span named Worker.run {queueName} for each job processed. The span captures job metadata, queue time, and any errors thrown during processing.

Lifecycle events

Lock extensions, job removals, and retries are recorded as events on the active consumer span (not separate spans).

BullMQ-specific attributes

In addition to the standard job attributes, the BullMQ instrumentation emits these extra attributes:

Attribute	Description
`messaging.bullmq.job.name`	Job name
`messaging.bullmq.job.timestamp`	Job creation timestamp
`messaging.bullmq.job.delay`	Job delay in ms
`messaging.bullmq.job.attempts`	Total attempts made
`messaging.bullmq.job.failedReason`	Failure reason (set after processing)
`messaging.bullmq.job.finishedOn`	Completion timestamp
`messaging.bullmq.job.processedOn`	Processing start timestamp
`messaging.bullmq.job.repeatJobKey`	Repeat job key (for recurring jobs)
`messaging.bullmq.job.bulk.names`	Array of job names in bulk operations
`messaging.bullmq.worker.concurrency`	Worker concurrency setting
`messaging.bullmq.worker.lockDuration`	Lock duration in ms
`messaging.bullmq.worker.lockRenewTime`	Lock renew interval in ms
`messaging.bullmq.worker.rateLimiter.max`	Rate limiter max
`messaging.bullmq.worker.rateLimiter.duration`	Rate limiter duration

Getting Started

Monocle Studio

Frameworks

Features

Integrations

Other

Installation

Usage

Configuration

Span linking vs parenting

Spans

Producer spans

Consumer spans

Lifecycle events

BullMQ-specific attributes

​Installation

​Usage

​Configuration

​Span linking vs parenting

​Spans

​Producer spans

​Consumer spans

​Lifecycle events

​BullMQ-specific attributes

Installation

Usage

Configuration

Span linking vs parenting

Spans

Producer spans

Consumer spans

Lifecycle events

BullMQ-specific attributes