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When doing regular signing expiry time is jittered to make sure that the re-signing times are not clumped together. This expands this behaviour to expiry times of dynamically added records. When incrementally re-signing a zone use the full jitter range if the server appears to have been offline for greater than 5 minutes otherwise use a small jitter range of 3600 seconds. This will stop the signatures becoming more clustered if the server has been off line for a significant period of time (> 5 minutes).
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