v0.9.0

This release contains bugfixes and upgrades to Kubernetes 1.25.

Breaking API changes:

- Upgrading to K8s 1.25. NB: Autoscaling requires K8s control planes
  with a version equal or +1; i.e. K8s 1.25 OR 1.26 is not required.

Features:

- New metrics! (#306, #310)
  - Too many to cover here; refer to those PRs intead.

Fixes:

- util/watch: Fix race condition on k8s watch.Update events (#295)
- agent/informant: Fix informant server exit logs (#286)
- api: Fix ExtractVmInfo disallowing min > use or use > max (#303)
  - this one may be counterintuitive at first. See #249 for context
- agent: Fix vmEvent formatting (#307)
- informant: Suspend old agent *before* new one (#308)
- util/watch: Fix racy behavior with InitModeDefer (#305)
  - This was causing billing events to not be generated for VMs until an
    event *after* startup occurs for them.
- plugin: Allow overcommitted nodes on startup (#313)
- agent: Stop SchedulerWatch when Runner finishes (#314)
  - This was preventing the switchover to a new scheduler on upgrade or
    restart

Other changes:

- Fix yaml formatting for autoscaler-agent config deploy (#300)

No protocol changes.

Upgrade path from v0.8.0:

- No ordering requirements.