Released on October 26, 2017, Grafana 4.6 introduced significant features and improvements, including a new Postgres data source, Cloudwatch alerting support, and enhancements to the Prometheus query editor. The update allows users to create annotations directly from the graph panel and supports alert rules for Cloudwatch metrics. The Prometheus enhancements include instant queries and autocomplete features, improving data exploration and filtering. Additionally, Grafana 4.6 added support for Google Cloud Storage, open tracing with Jaeger, and new date and time unit types. The release also included updates to alert notifications, such as integration with Pagerduty, Slack, Hipchat, and Kafka. The transition from systemjs to webpack for building from source was highlighted, alongside a call to action for early bird tickets and talk submissions for GrafanaCon EU.