message: better flusing with 8 threads
diff: @@ -163,9 +163,11 @@ objects:
  <buffer tag,time>
  @type memory
  timekey 3600
  + timekey_wait 0s
  flush_mode interval
  flush_interval 1s
  - overflow_action block
  + chunk_limit_size 32MB
  + flush_thread_count 8
  </buffer>
  id_key viaq_msg_id
  remove_keys viaq_msg_id, viaq_index_name, kubernetes.master_url
  