Setup stats for each site.

Initialize the statistics collection machinery.

Collect log data from cowmachine and update cowmachine metrics

The log entry from zotonic_listen_http_metrics is:

  Log = #{
      site => Site,
      reason => Reason,
      req_start => ReqStart,
      duration_total_usec => DurationTotalUsec,
      duration_process_usec => DurationProcessUsec,
      resp_status => RespStatus,
      resp_status_category => StatusCategory,
      req_bytes => ReqBodyLength,
      resp_bytes => RespBodyLength,
      http_version => cowboy_req:version(Req),
      method => cowboy_req:method(Req),
      path => cowboy_req:path(Req),
      user_agent => cowboy_req:header(<<"user-agent">>, Req),
      referer => cowboy_req:header(<<"referer">>, Req),
      metrics => UserData#{ peer_ip => PeerIP }
  }

Count some amount, like data transfers

Record a duration

Count a event

Start the log buffer consumer.