Long response time between lora server and class C node

Dear All

I sent downlink message to my class c node.
But, I got the message from my node which is need to 6 seconds and more.
I think unreasonable for class C node and loraserver.
so, I check lora server log and setting. I discover some error from mosquitto or fluentd DB.
I attach the error picture in this post.
P.s. I guess some component or wrong version for Lora server.

The Mosquitto messages look like a reasonable connection and disconnection for publishing. Fluentd is not part of the ChirpStack stack, I would suggest removing it and trying again without it in the mix.

I remove the Fluentd from docker.yam.
No show this message, but response time also long.