Watchtower to telegraf to influx to grafana

[Remcovf]

Hi,

I use watchtower stack

_version: "3"

services:
watchtower:
image: containrrr/watchtower:latest
container_name: watchtower
restart: unless-stopped
environment:
- TZ=Europe/Amsterdam

  - DOCKER_API_VERSION=1.44

  # remove old images after update (useful for saving space)
  # - WATCHTOWER_CLEANUP=false

  # the below will ignore labels set. It is worth checking out labels as that can be a more scalable solution (automatic)
  # - WATCHTOWER_DISABLE_CONTAINERS=traefik crowdsec bouncer-traefik deconz frigate home-assistant homeassistant-db

  # the docker host can also be remote by specifying tcp
  # - DOCKER_HOST=tcp://hostname:port

  # how frequently to check for images (default is 24 hours)
  # - WATCHTOWER_POLL_INTERVAL=86400

  # choose whether to restart the containers after updates
  # - WATCHTOWER_INCLUDE_RESTARTING=true

  # choose whether to update stopped and exited containers
  # - WATCHTOWER_INCLUDE_STOPPED=true
  - WATCHTOWER_HTTP_API_METRICS
  - WATCHTOWER_HTTP_API_TOKEN=WatchTowerAPI

  # this will start containers that were stopped or exited if they are updated
  # - WATCHTOWER_REVIVE_STOPPED=true

  # watchtower can behave like DIUN by only notifying, and not updating
  - WATCHTOWER_MONITOR_ONLY=true
  - WATCHTOWER_SCHEDULE=0/5 * 9-21 * * *

  # you can tell watchtower to do updates and restarts one by one - can be helpful
  # - WATCHTOWER_ROLLING_RESTART=true

  # Meerdere notificatiekanalen tegelijk
  - WATCHTOWER_NOTIFICATIONS=shoutrrr
  - WATCHTOWER_NOTIFICATION_URL=generic+http://telegraf:8087/watchtower


  # - WATCHTOWER_NOTIFICATIONS=gotify
  # - WATCHTOWER_NOTIFICATION_GOTIFY_URL=https://gotify.example.com
  # - WATCHTOWER_NOTIFICATION_GOTIFY_TOKEN=/run/secrets/access_token

volumes:
  - /var/run/docker.sock:/var/run/docker.sock
  # - /root/.docker/config.json:/config.json   # Enable this when using a custom repo

ports:
  - "8080:8080"
networks:
  - watchtower-net

networks:
watchtower-net:
external: true_

And telegraf stack

_version: "3.8"

services:
telegraf:
image: telegraf:1.30
container_name: telegraf
environment:
- INFLUX_TOKEN=******
- INFLUX_ORG=*****
- INFLUX_BUCKET=****
volumes:
- /docker/telegraf/telegraf.conf:/etc/telegraf/telegraf.conf:ro

ports:
  - "8087:8087"   # Telegraf HTTP Listener
restart: unless-stopped
networks:
  - watchtower-net

networks:
watchtower-net:
external: true_

A config file

_[agent]
omit_hostname = true

[[inputs.http_listener_v2]]
service_address = ":8087"
paths = ["/watchtower"]
data_format = "json"
json_string_fields = ["message","container","old_image","new_image","timestamp"]

[[outputs.influxdb_v2]]
urls = ["http://influxdb:8086"]
token = "$INFLUX_TOKEN"
organization = "$INFLUX_ORG"
bucket = "$INFLUX_BUCKET"_

but the logging in watchtower gives me
time="2025-12-09T13:33:56+01:00" level=error msg="Failed to send shoutrrr notification" error="an error occurred while sending notification to generic webhook: server returned response status code 400 Bad Request" index=0 notify=no service=generic+http

somebody any idea?