The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino experiment that will soon begin data taking. Its large data volume and international collaboration require a distributed computing infrastructure (DCI) across several sites. To ensure stable operations, we developed a new monitoring system that combines log collection, active service probing, workflow-based task management, visualization, and automated alerts. The system has been applied successfully in JUNO Data Challenges and is prepared for integration into routine operations. Future developments will focus on extending metrics, coupling with production systems, and expanding to other experiments.
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