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This commit enables Cilium's host firewall feature and makes use of it
to deny external connections to two exporters running as daemonset pods
in the host network namespace.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **New Features**
- Host firewall is now enabled by default, adding an extra layer of
security.
- Enhanced network traffic management with new policies:
- One policy tightens access to critical service ports.
- Another secures monitoring endpoints by restricting unauthorized
external access.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>