mod_pubsub_serverinfo: Warm-up opt-in cache By warming up the cache that contains the opt-in data, the first publication has a better chance of including domain names for remote domains that opt-in. Without this change, those domains are named only after the _second_ publication, which can take a while. New users are likely thrown off by that.

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labels:
- Statistics
summary: Collect statistics on user registration
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Description
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This module measures the rate at which users register on the server (through
providers like `mod_register_ibr` or `mod_register_web`).