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Automatic merge from submit-queue. 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>. Enable scaling fluentd-gcp resources using ScalingPolicy. See https://github.com/justinsb/scaler for more details about ScalingPolicy resource. **What this PR does / why we need it**: This is adding a way to override fluentd-gcp resources in a running cluster. The resources syncing for fluentd-gcp is decoupled from addon manager. **Special notes for your reviewer**: **Release note**: ```release-note fluentd-gcp resources can be modified via a ScalingPolicy ``` cc @kawych @justinsb