﻿---
title: Azure Service Bus
description: Instrumentation can be enabled for Azure Service Bus by referencing Elastic.Apm.Azure.ServiceBus package and subscribing to diagnostic events using one...
url: https://www.elastic.co/elastic/docs-builder/docs/3002/reference/apm/agents/dotnet/setup-azure-servicebus
products:
  - APM .NET Agent
  - APM Agent
applies_to:
  - Serverless Observability projects: Generally available
  - Elastic Stack: Generally available
  - Application Performance Monitoring Agent for .NET: Generally available
---

# Azure Service Bus
## Quick start

Instrumentation can be enabled for Azure Service Bus by referencing [`Elastic.Apm.Azure.ServiceBus`](https://www.nuget.org/packages/Elastic.Apm.Azure.ServiceBus) package and subscribing to diagnostic events using one of the subscribers:
1. If the agent is included by referencing the `Elastic.Apm.NetCoreAll` package, the subscribers will be automatically subscribed with the agent, and no further action is required.
2. If you’re using `Microsoft.Azure.ServiceBus`, subscribe `MicrosoftAzureServiceBusDiagnosticsSubscriber` with the agent
   ```csharp
   Agent.Subscribe(new MicrosoftAzureServiceBusDiagnosticsSubscriber());
   ```
3. If you’re using `Azure.Messaging.ServiceBus`, subscribe `AzureMessagingServiceBusDiagnosticsSubscriber` with the agent
   ```csharp
   Agent.Subscribe(new AzureMessagingServiceBusDiagnosticsSubscriber());
   ```

A new transaction is created when
- one or more messages are received from a queue or topic subscription.
- a message is receive deferred from a queue or topic subscription.

A new span is created when there is a current transaction, and when
- one or more messages are sent to a queue or topic.
- one or more messages are scheduled to a queue or a topic.