Documentation Grafana Cloud Monitor applications Application Observability Release notes 1.66

Release notes for Application Observability plugin 1.66

1.66.0

Released on 2025-11-10.

• Activating Tempo metrics generation now uses native histograms by default
• Add support for .NET 9 garbage collection runtime metrics
• Fixed an issue where Filter by and Group by attribute updates weren’t saved when using the Otel collector with Tempo metrics generation
• Fixed service overview tabs breaking when entity names contained unsupported characters