The mailing list is the central place for announcements and development issues. New versions of collectd are announced on the mailing list and we're discussing development related topics here. It used to be the place for bugs and problems, too, but this proved to be impractical. You can still ask your questions there, but please make sure to read the FAQs first. Please don't be surprised if we ask you to open a bug in the bugtracking system.
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You can read archived message in the mailing list archives. Please do that before asking questions that may have been answered before.