997e777c03
Automatic merge from submit-queue (batch tested with PRs 56115, 55143, 56179). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Do not add new field in fluentd CRI log format.
After https://github.com/kubernetes/kubernetes/pull/55922 is merged, the test `Cluster level logging implemented by Stackdriver should ingest logs` starts to fail in cri-containerd cluster e2e test.
https://k8s-testgrid.appspot.com/sig-node-containerd#e2e-gci
I believe the reason is that the GCP fluentd plugin assumes that there are only `timestamp`, `severity`, `stream` and `log|message|msg` fields in the log entry.
If there is any other fields, GCP fluentd plugin will not try to convert the payload to json, even if the log content is json. The plugin deletes `stream`, `timestamp` and `severity`, then assumes that there is only one field left e13c89a1b6/lib/fluent/plugin/out_google_cloud.rb (L495).
This PR removes the tag field. With this, fluentd GCP plugin should work again.
@yujuhong @crassirostris
/cc @kubernetes/sig-node-bugs @kubernetes/sig-instrumentation-bugs
/cc @derekwaynecarr for milestone approve. Thanks!
**Release note**:
```release-note
none
```
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