This blog post covers examples of cross-cluster and cross-service querying, including handy syntax, code snippets and notebooks that you can use in Azure Data Studio.
As some of you may already know, Kusto (KQL) extension is available in Azure Data Studio, which allows you to explore Azure Data Explorer (ADX) more natively. ADX also supports cross-cluster and cross-service queries between ADX, Azure AppInsights and Azure Log Analytics. This cross- service query preview feature is documented in Query data in Azure Monitor using Azure Data Explorer.
Click through for the demos.