The Apollo Changelog for March 6, 2023, highlights several key updates, including the sharing of details about Apollo's monorepo by engineer Ryan Wilcox, a new blog post on handling null in Kotlin clients, and an announcement that GraphQL Yoga, GraphQL Helix, and NestJS have been validated to support the `@composeDirective` and `@interfaceObject` directives. Additionally, the changelog mentions updates to Apollo Client, Rover, and Apollo Router, as well as a community spotlight featuring Volvo's blog series about their adventures with Apollo Federation. The summary also notes that new GraphQL Summit talk summaries have been released on the Apollo YouTube channel.