The best practices for policies are listed here.
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Use policies sparingly
Try to keep a few different policies and apply policies on groups of objects. Meanwhile, it is possible to apply any policy to a concrete object.
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Clone policies to edit and make changes
If it is necessary to edit or change some of the content (metrics, alerts, and capacity settings), it is recommended to use a distinguished policy (can be even a currently active policy) before making or applying any change.
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Do NOT change or edit the default policy
At any time, do not directly edit or change the default policy, as it has an impact on all existing objects