Release notes for Grafana 9.0.0-beta1

Features and enhancements

AccessControl: Add setting for permission cache. (Enterprise)
AccessControl: Check dashboard permissions for reports. (Enterprise)
Auth: Remove grafana ui dependency to the aws sdk. #43559, @sunker
BasicRoles: Add API endpoint to reset basic roles permissions to factory. (Enterprise)
LDAP Mapping: Allow Grafana Admin mapping without org role. #37189, @krzysdabro
Licensing: Only enforce total number of users. (Enterprise)
Loki: do not convert NaN to null. #45389, @gabor
Report: API support for multiple dashboards. (Enterprise)
Report: Support sending embedded image in the report email. (Enterprise)
Report: UI for multiple dashboards. (Enterprise)
Reporting: Remove redundant empty attachment when export to CSV is enabled. (Enterprise)
SAML: Implement Name Templates for assertion_attribute_name option. (Enterprise)
SSE/Alerting: Support prom instant vector responses. #44865, @kylebrandt
Tracing: Add trace to metrics config behind feature toggle. #46298, @connorlindsey

Bug fixes

Fix: Prevent automatic parsing of string data types to numbers. #46035, @joshhunt
Prometheus: Fix inconsistent labels in exemplars resulting in marshal json error. #46135, @hanjm

Breaking changes

In the Loki data source, for consistency and performance reasons, we changed how we represent NaN (not a number) values received from Loki. In the past versions, we converted these to null in the frontend (for dashboard and explore), and kept as NaN in the alerting path. Starting with this version, we will always keep it as NaN. This change should be mostly invisible for the users. Issue #45389

The dependency to grafana/aws-sdk is moved from grafana/ui to the plugin. This means that any plugin that use SIGV4 auth need to pass a SIGV4 editor component as a prop to the DataSourceHttpSettings component. Issue #43559