libapache2-mod-log-slow - 1.0.8-3.1+b1 main

Provide measures of the time period used for handling each request by the
current process. Logging is done after processing a request if the request
takes more than certain period of time that you specify. The idea of this
module comes from MySQL's slow-query-log, and its logging logic is partially
based on mod_log_forensic.