MQTT Alerts Working Manually but Not Automatically

[Lacrymal3]

Hello everyone,

I apologize in advance for my limited English and low technical level.

I am trying to receive notifications via MQTT whenever there is a change to my Docker containers, but I can’t get it to work properly.

I am using a Synology NAS and Container Manager. When I run this command:
docker compose exec diun diun notif test

I do receive the notification. However, when I create a container, there is an update, or I update a container, I don’t receive anything.

Here is an excerpt from the logs when creating a container:

diun | Sat, 06 Dec 2025 22:36:07 CET INF Next run in 55 seconds (2025-12-06 22:37:00.697439281 +0100 CET)
diun | Sat, 06 Dec 2025 22:37:00 CET INF Cron triggered
diun | Sat, 06 Dec 2025 22:37:00 CET INF Found 4 image(s) to analyze provider=docker
diun | Sat, 06 Dec 2025 22:37:03 CET INF Jobs completed added=0 failed=0 skipped=0 unchanged=4 updated=0
diun | Sat, 06 Dec 2025 22:37:03 CET INF Next run in 1 minute (2025-12-06 22:38:09.497565182 +0100 CET)
diun | Sat, 06 Dec 2025 22:38:09 CET INF Cron triggered
diun | Sat, 06 Dec 2025 22:38:09 CET INF Found 5 image(s) to analyze provider=docker
diun | Sat, 06 Dec 2025 22:38:11 CET INF Jobs completed added=0 failed=0 skipped=0 unchanged=5 updated=0
diun | Sat, 06 Dec 2025 22:38:11 CET INF Next run in 1 minute (2025-12-06 22:39:16.707075696 +0100 CET)

And here is my docker-compose.yml file:

version: "3.8"

services:
  diun:
    image: crazymax/diun:latest
    container_name: diun
    command: serve
    volumes:
      - "./data:/data"
      - "/var/run/docker.sock:/var/run/docker.sock"
    environment:
      - TZ=Europe/Paris
      - DIUN_LOG_LEVEL=debug

      - DIUN_WATCH_WORKERS=20
      - DIUN_WATCH_SCHEDULE=* * * * *
      - DIUN_WATCH_JITTER=30s

      - DIUN_PROVIDERS_DOCKER=true
      - DIUN_PROVIDERS_DOCKER_WATCHBYDEFAULT=true

      - DIUN_DEFAULTS_NOTIFYON=new,update,unchange

      - DIUN_NOTIF_MQTT=true
      - DIUN_NOTIF_MQTT_SCHEME=mqtt
      - DIUN_NOTIF_MQTT_HOST=192.168.1.32
      - DIUN_NOTIF_MQTT_PORT=1883
      - DIUN_NOTIF_MQTT_USERNAME=user
      - DIUN_NOTIF_MQTT_PASSWORD=password
      - DIUN_NOTIF_MQTT_CLIENT=diun
      - DIUN_NOTIF_MQTT_TOPIC=diun
      - DIUN_NOTIF_MQTT_QOS=0

    labels:
      - "diun.enable=true"

    restart: always

If anyone has encountered this problem before or knows why Diun doesn’t trigger notifications automatically, I would greatly appreciate your advice.

Thank you in advance for your help!