Deprecating LogAnalytics.Client after 330,000+ downloads, and how to migrate

This article announces the deprecation of LogAnalytics.Client, a popular open-source .NET library for sending custom log data to Azure Log Analytics, which has been downloaded over 330,000 times. The author explains the library's history, its reliance on the now-deprecated HTTP Data Collector API, and the retirement deadline of September 14, 2026. The official replacement is Azure.Monitor.Ingestion, which uses Microsoft Entra ID authentication and Data Collection Rules. The article provides a detailed migration guide, including setting up Azure resources like custom tables, Data Collection Rules, and app registrations, along with code examples for transitioning from the old library to the new SDK.