app-admin/fluent-bit: add more system logs

These new logs are sometimes useful for troubleshooting and are low
volume.

I've also considered adding:
- cloud-final.service
- cloud-init.service
- containerd.service
- pid 1
- sshd.service

but I was worried that those might increase logging volume higher than
what users might expect.

BUG=b/326096865
TEST=presubmit
RELEASE_NOTE=Added more service logs to the default Cloud Logging
configuration.

Change-Id: I8b057e3ceeba8cde9e43107ecfc98c9262bff1d7
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/77260
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
2 files changed