Too many log messages in syslog on any particular log level.

On ERROR level, i would expect never to see any messages appear.
NOTICE should be the default logging level for people's configuration, or INFO if monitoring is attached. NOTICE and INFO messages should be well-defined.
EMERGency and ALERT are not to be used, as this is not hardware related. CRITical messages are for crashes and other unintentional termination. ERRors are for non-operational errors, such as unexpected but recoverable situations, not for communication errors and alike (or we should split out into multiple logs). WARNings for similar situations which we may judge to be possible. Example are repeated connection problems. NOTICE for normal operational messages that should be picked up by operators (such as DS submit, but not the fact that a zone got signed). INFO a low traffic informational, such as a zone got signed (but not a key got generated).
There is too much debugging output made unconditionally.