mod_prometheus: Invoke stats collection if in 'manual' mode Since 10d13e0554f9 a special value for statistics_interval "manual" exists, where a module is expected to invoke processing in connection to collection of stats. This makes internal collection and exporting to Prometheus happens at the same time with no chance of timers getting out of sync.

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−summary: Storage benchmark tool
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−...
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−To benchmark `mod_storage_internal`:
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−    prosodyctl mod_benchmark_storage internal
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−Does a number (aprox. 10000) of reads and writes and to the selected
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−storage driver and tells you how long it took.