Memory Leak?

[seemawn1981]

Hi,
I have a running mqttd-server on docker. Here is the docker-compose-file:

services:
  mqtt:
    image: bytebeamio/rumqttd:latest
    ports:
      - 1883:1883
      - 1884:1884
    volumes:
      - /home/seemawn/docker/mqttd/rumqttd.toml:/rumqttd.toml
    command: -c rumqttd.toml
    restart: unless-stopped

Actually there is only one client that sends data and one client that subscribes a few topics.

But the memory usage increases steadily:

CONTAINER ID   NAME           CPU %     MEM USAGE / LIMIT     MEM %     NET I/O         BLOCK I/O    PIDS
adaaf982e78c   mqttd-mqtt-1   0.33%     3.662GiB / 31.12GiB   11.77%    961MB / 824MB   4.1kB / 0B   8

As you can see, the usage is 3,66 GB.
Did I do something wrong?