Release 15.4.7

[r0mant]

• Updated Go toolchain to v1.22.5. #43769
• Reduced CPU usage in auth servers experiencing very high concurrent request load. #43760
• Machine ID defaults to disabling the use of the Kubernetes exec plugin when writing a Kubeconfig to a directory destination. This removes the need to manually configure disable_exec_plugin. #43656
• Fixed startup crash of Teleport Connect on Ubuntu 24.04 by adding an AppArmor profile. #43652
• Added support for dialling leaf clusters to the tbot SSH multiplexer. #43635
• Extend Teleport ability to use non-default cluster domains in Kubernetes, avoiding the assumption of cluster.local. #43632
• Wait for user MFA input when reissuing expired certificates for a kube proxy. #43613
• Improved error diagnostics when using Machine ID's SSH multiplexer. #43587

Enterprise:

• Increased Access Monitoring refresh interval to 24h.
• Teleport Enterprise now supports the TELEPORT_REPORTING_HTTP(S)_PROXY environment variable to specify the URL of the HTTP(S) proxy used for connections to our usage reporting ingest service.