9.0rc7

UNRELEASED

Breaking changes

• temBoard agent v8 can't register to v8. Use temboard register or upgrade agent to v9.
  temBoard UI v9 can still manage agent v8.

Other changes

• Postgres 17 support.
• ui: Fix deletion of host metrics when removing an instance of multi-instances host.
• ui: Remove support for 7.x agents.
• ui: Accept editing an offline instance.
• ui: Search for .config/temboard.conf.
• ui: Integrate pev2.
• agent: Recover admin shutdown, backend terminated, etc.
• Packages for Ubuntu 24.04 Noble.
• Remove python 2.7 support.
• Remove daemonization. Use nohup or systemd.
• Dropped pluging hotplug.
• Drop rhel7 and buster support, minimum versions are now 6.0.2 for tornado
  and 1.3.2 for sqlalchemy.
• Fix error handling in agent plugins.