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Send logs to Azure Data Explorer (Kusto)

Azure Data Explorer (Kusto)

The Kusto output plugin allows to ingest your logs into an Azure Data Explorer cluster, via the Queued Ingestion mechanism. This output plugin can also be used to ingest logs into an Eventhouse cluster in Microsoft Fabric Real Time Analytics.

For ingesting into Azure Data Explorer: Creating a Kusto Cluster and Database

You can create an Azure Data Explorer cluster in one of the following ways:

For ingesting into Microsoft Fabric Real Time Analytics : Creating an Eventhouse Cluster and KQL Database

You can create an Eventhouse cluster and a KQL database follow the following steps:

Creating an Azure Registered Application

Fluent-Bit will use the application's credentials, to ingest data into your cluster.

Creating a Table

Fluent-Bit ingests the event data into Kusto in a JSON format, that by default will include 3 properties:

  • log - the actual event payload.
  • tag - the event tag.
  • timestamp - the event timestamp.

A table with the expected schema must exist in order for data to be ingested properly.

.create table FluentBit (log:dynamic, tag:string, timestamp:datetime)

Optional - Creating an Ingestion Mapping

By default, Kusto will insert incoming ingestions into a table by inferring the mapped table columns, from the payload properties. However, this mapping can be customized by creatng a JSON ingestion mapping. The plugin can be configured to use an ingestion mapping via the ingestion_mapping_reference configuration key.

Configuration Parameters

Key Description Default
tenant_id Required - The tenant/domain ID of the AAD registered application.
client_id Required - The client ID of the AAD registered application.
client_secret Required - The client secret of the AAD registered application (App Secret).
ingestion_endpoint Required - The cluster's ingestion endpoint, usually in the form `https://ingest-cluster_name.region.kusto.windows.net
database_name Required - The database name.
table_name Required - The table name.
ingestion_mapping_reference Optional - The name of a JSON ingestion mapping that will be used to map the ingested payload into the table columns.
log_key Key name of the log content. log
include_tag_key If enabled, a tag is appended to output. The key name is used tag_key property. On
tag_key The key name of tag. If include_tag_key is false, This property is ignored. tag
include_time_key If enabled, a timestamp is appended to output. The key name is used time_key property. On
time_key The key name of time. If include_time_key is false, This property is ignored. timestamp
workers The number of workers to perform flush operations for this output. 0

Configuration File

Get started quickly with this configuration file:

[OUTPUT]
    Match *
    Name azure_kusto
    Tenant_Id <app_tenant_id>
    Client_Id <app_client_id>
    Client_Secret <app_secret>
    Ingestion_Endpoint https://ingest-<cluster>.<region>.kusto.windows.net
    Database_Name <database_name>
    Table_Name <table_name>
    Ingestion_Mapping_Reference <mapping_name>

Troubleshooting

403 Forbidden

If you get a 403 Forbidden error response, make sure that:

  • You provided the correct AAD registered application credentials.
  • You authorized the application to ingest into your database or table.