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Stream Azure monitoring data to an event hub and external partner

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An effective method to stream data from Azure Monitor to external tools is by using Azure Event Hubs. This article provides a description of how to stream data to Event Hubs and lists some of the partners that can consume that data from the hub. Some partners integrate with Azure Monitor and have Azure hosted services.

Create an Event Hubs namespace

Before you configure streaming for a data source, you need to create an Event Hubs namespace and event hub. This namespace and event hub is the destination for all of your monitoring data. An Event Hubs namespace is a logical grouping of event hubs that share the same access policy, much like a storage account has individual containers for blobs within the storage account. Consider the following details about the Event Hubs namespace and event hubs that you use for streaming monitoring data:

  • The number of throughput units allows you to increase throughput scale for your event hubs. Only one throughput unit is typically necessary. If you need to scale up as your log usage increases, you can manually increase the number of throughput units for the namespace or enable auto inflation.
  • The number of partitions allows you to parallelize consumption across many consumers. A single partition can support up to 20 MBps or approximately 20,000 messages per second. Depending on the tool consuming the data, it might or might not support consuming from multiple partitions. Four partitions are reasonable to start with if you're not sure about the number of partitions to set.
  • Set message retention on your event hub to at least seven days. If your consuming tool goes down for more than a day, this retention ensures that the tool can pick up where it left off for events up to seven days old.
  • Use the default consumer group for your event hub. There's no need to create other consumer groups or use a separate consumer group unless you plan to have two different tools consume the same data from the same event hub.
  • For the Azure activity log, when you select an Event Hubs namespace, Azure Monitor creates an event hub within that namespace called insights-logs-operational-logs. For other log types, you can either choose an existing event hub or have Azure Monitor create an event hub per log category.
  • Outbound port 5671 and 5672 must be opened on the machine or virtual network consuming data from the event hub.

Streaming methods

Data can be sent to Event Hubs by using the following methods in Azure Monitor:

Data formats

The following JSON is an example of metrics data sent to an event hub:

[
  {
    "records": [
      {
        "count": 2,
        "total": 0.217,
        "minimum": 0.042,
        "maximum": 0.175,
        "average": 0.1085,
        "resourceId": "/SUBSCRIPTIONS/AAAA0A0A-BB1B-CC2C-DD3D-EEEEEE4E4E4E/RESOURCEGROUPS/RG-001/PROVIDERS/MICROSOFT.WEB/SITES/SCALEABLEWEBAPP1",
        "time": "2023-04-18T09:03:00.0000000Z",
        "metricName": "CpuTime",
        "timeGrain": "PT1M"
      },
      {
        "count": 2,
        "total": 0.284,
        "minimum": 0.053,
        "maximum": 0.231,
        "average": 0.142,
        "resourceId": "/SUBSCRIPTIONS/AAAA0A0A-BB1B-CC2C-DD3D-EEEEEE4E4E4E/RESOURCEGROUPS/RG-001/PROVIDERS/MICROSOFT.WEB/SITES/SCALEABLEWEBAPP1",
        "time": "2023-04-18T09:04:00.0000000Z",
        "metricName": "CpuTime",
        "timeGrain": "PT1M"
      },
      {
        "count": 1,
        "total": 1,
        "minimum": 1,
        "maximum": 1,
        "average": 1,
        "resourceId": "/SUBSCRIPTIONS/AAAA0A0A-BB1B-CC2C-DD3D-EEEEEE4E4E4E/RESOURCEGROUPS/RG-001/PROVIDERS/MICROSOFT.WEB/SITES/SCALEABLEWEBAPP1",
        "time": "2023-04-18T09:03:00.0000000Z",
        "metricName": "Requests",
        "timeGrain": "PT1M"
      },
    ...
    ]
  }
]

The following JSON is an example of log data sent to an event hub:

[
  {
    "records": [
      {
        "time": "2023-04-18T09:39:56.5027358Z",
        "category": "AuditEvent",
        "operationName": "VaultGet",
        "resultType": "Success",
        "correlationId": "cccc2222-dd33-4444-55ee-666666ffffff",
        "callerIpAddress": "10.0.0.10",
        "identity": {
          "claim": {
            "http://schemas.microsoft.com/identity/claims/objectidentifier": "123abc12-abcd-9876-cdef-123abc456def",
            "appid": "44445555-eeee-6666-ffff-7777aaaa8888"
          }
        },
        "properties": {
          "id": "https://mykeyvault.vault.azure.net/",
          "clientInfo": "AzureResourceGraph.IngestionWorkerService.global/1.23.1.224",
          "requestUri": "https://northeurope.management.azure.com/subscriptions/aaaa0a0a-bb1b-cc2c-dd3d-eeeeee4e4e4e/resourceGroups/rg-001/providers/Microsoft.KeyVault/vaults/mykeyvault?api-version=2023-02-01&MaskCMKEnabledProperties=true",
          "httpStatusCode": 200,
          "properties": {
            "sku": {
              "Family": "A",
              "Name": "Standard",
              "Capacity": null
            },
            "tenantId": "bbbbcccc-1111-dddd-2222-eeee3333ffff",
            "networkAcls": null,
            "enabledForDeployment": 0,
            "enabledForDiskEncryption": 0,
            "enabledForTemplateDeployment": 0,
            "enableSoftDelete": 1,
            "softDeleteRetentionInDays": 90,
            "enableRbacAuthorization": 0,
            "enablePurgeProtection": null
          }
        },
        "resourceId": "/SUBSCRIPTIONS/AAAA0A0A-BB1B-CC2C-DD3D-EEEEEE4E4E4E/RESOURCEGROUPS/RG-001/PROVIDERS/MICROSOFT.KEYVAULT/VAULTS/mykeyvault",
        "operationVersion": "2023-02-01",
        "resultSignature": "OK",
        "durationMs": "16"
      }
    ],
    "EventProcessedUtcTime": "2023-04-18T09:42:07.0944007Z",
    "PartitionId": 1,
    "EventEnqueuedUtcTime": "2023-04-18T09:41:14.9410000Z"
  },
...

Partner tools with Azure Monitor integration

Routing your monitoring data to an event hub with Azure Monitor enables you to easily integrate with external SIEM and monitoring tools. The following table lists examples of tools with Azure Monitor integration.

Tool Hosted in Azure Description
IBM QRadar No The Microsoft Azure DSM and Microsoft Azure Event Hubs Protocol are available for download from the IBM support website.
Splunk No Splunk Add-on for Microsoft Cloud Services is an open-source project available in Splunkbase.

If you can't install an add-on in your Splunk instance and you're using a proxy or running on Splunk Cloud, you can forward these events to the Splunk HTTP Event Collector by using Azure Function for Splunk. This tool is triggered by new messages in the event hub.
SumoLogic No Instructions for setting up SumoLogic to consume data from an event hub are available at Collect Logs for the Azure Audit App from Event Hubs.
ArcSight No The ArcSight Azure Event Hubs smart connector is available as part of the ArcSight smart connector collection.
Syslog server No If you want to stream Azure Monitor data directly to a Syslog server, you can use a solution based on an Azure function.
LogRhythm No Instructions to set up LogRhythm to collect logs from an event hub are available at this LogRhythm website.
Logz.io Yes For more information, see Get started with monitoring and logging by using Logz.io for Java apps running on Azure.

Next steps