.Meta.Hostname shows hex-digit string, but no plain text hostname

[strenker]

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I've found a bug and checked that ...

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• ... there are no open or closed issues that are related to my problem

Description

{{ .Meta.Hostname }} does not show a plain text hostname as i would have expected, but a hex-digit string. Regardless of hostname length these hex-digit strings are always of the same length. Maybe .Meta.Hostname resolves to a memory address and not to the content where this address points to.

Expected behaviour

.Meta.Hostname should resolve to a plain text hostname

Actual behaviour

.Meta.Hostname resolves to hex-digit srting

Steps to reproduce

Use it in Message Body or in Message Title

Diun version

4.33.0

Docker info

raspi-02 ~ # docker info
Client:
 Version:    29.1.3
 Context:    default
 Debug Mode: false
 Plugins:
  compose: Docker Compose (Docker Inc.)
    Version:  v5.0.1
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 6
  Running: 6
  Paused: 0
  Stopped: 0
 Images: 6
 Server Version: 29.1.3
 Storage Driver: overlay2
  Backing Filesystem: btrfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 301b2dac98f15c27117da5c8af12118a041a31d9
 runc version: c241c0bb5e60a8e8c1b2e53d4eca8d0068d8d57e
 init version: de40ad007797e0dcd8b7126f27bb87401d224240
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.18.36-v8-4k+
 Operating System: Gentoo Linux
 OSType: linux
 Architecture: aarch64
 CPUs: 4
 Total Memory: 7.76GiB
 Name: raspi-02.trenker.xyz
 ID: 84e844af-b0fb-474b-97a9-6812b2593115
 Docker Root Dir: /var/data01/docker
 Debug Mode: false
 Username: strenker
 Experimental: false
 Insecure Registries:
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false
 Firewall Backend: iptables

Docker Compose config

name: diun

services:
  diun:
    image: crazymax/diun:latest
    command: serve
    restart: always
    volumes:
      - "/var/data01/diun/volumes/data:/data"
      - "/var/run/docker.sock:/var/run/docker.sock"
    environment:
      - "TZ=Europe/Berlin"
      - "DIUN_WATCH_WORKERS=10"
      - "DIUN_WATCH_SCHEDULE=0 */6 * * *"
      - "DIUN_WATCH_JITTER=30s"
      - "DIUN_PROVIDERS_DOCKER=true"
      - "DIUN_PROVIDERS_DOCKER_WATCHBYDEFAULT=true"
      - "DIUN_WATCH_FIRSTCHECKNOTIF=true"
      - "DIUN_NOTIF_MAIL_HOST=mailhost"
      - "DIUN_NOTIF_MAIL_PORT=587"
      - "DIUN_NOTIF_MAIL_INSECURESKIPVERIFY=false"
      - "DIUN_NOTIF_MAIL_USERNAME=user"
      - "DIUN_NOTIF_MAIL_PASSWORD=secret"
      - "DIUN_NOTIF_MAIL_FROM=user"
      - "DIUN_NOTIF_MAIL_TO=user1,user2"
    healthcheck:
      test: ["CMD", "diun", "healthcheck"]
      interval: 30s
      timeout: 5s
      retries: 3
      start_period: 60s
    labels:
      - "diun.enable=true"

Logs

Thu, 25 Jun 2026 10:59:48 CEST INF Starting Diun version=v4.33.0
Thu, 25 Jun 2026 10:59:48 CEST INF Configuration loaded from 14 environment variable(s)
Thu, 25 Jun 2026 10:59:48 CEST INF Cron triggered
Thu, 25 Jun 2026 10:59:48 CEST INF gRPC server listening addr=[::]:42286
Thu, 25 Jun 2026 10:59:48 CEST INF Found 6 image(s) to analyze provider=docker
Thu, 25 Jun 2026 10:59:49 CEST INF Jobs completed added=0 failed=0 skipped=0 unchanged=6 updated=0
Thu, 25 Jun 2026 10:59:49 CEST INF Cron initialized with schedule 0 */6 * * *
Thu, 25 Jun 2026 10:59:49 CEST INF Next run in 1 hour (2026-06-25 12:00:29.482140996 +0200 CEST)

Additional info

No response