Watchtower can fail sending Telegram report if it is too long

[stefa168]

Describe the bug

I have run a test run on a machine, and I am using Telegram as notification service.

Unfortunately, It looks like the amount of docker containers that have been updated (10) was a bit too much for Telegram's message length limit, so Watchtower failed to send the report entirely.

This is the message that has been reported instead in the logs:

watchtower-1  | time="2024-11-26T01:11:47+01:00" level=error msg="Failed to send shoutrrr notification" error="Message exceeds the max length" index=0 notify=no service=telegram

Steps to reproduce

Have Watchtower update enough containers to fill the entire size of a telegram message (4096 characters)

Expected behavior

Watchtower should be able to split the message in enough parts to send the entire message to Telegram's servers.

Screenshots

No response

Environment

• OS: Ubuntu 22.04.5 LTS x86_64
• Host: KVM/QEMU (Standard PC (Q35 + ICH9, 2009) pc-q35-9.0)
• Kernel: 5.15.0-125-generic
• Docker version 27.3.1, build ce12230

Your logs

watchtower-1  | time="2024-11-26T01:09:09+01:00" level=info msg="Found new lscr.io/linuxserver/duplicati:latest image (0ce371296951)"
watchtower-1  | time="2024-11-26T01:09:29+01:00" level=info msg="Found new portainer/portainer-ce:latest image (3c6403908069)"
watchtower-1  | time="2024-11-26T01:09:35+01:00" level=info msg="Found new eclipse-mosquitto:latest image (fdc6f47a31a7)"
watchtower-1  | time="2024-11-26T01:09:43+01:00" level=info msg="Found new edgd1er/webnut:latest image (c976dd34ee2e)"
watchtower-1  | time="2024-11-26T01:09:46+01:00" level=info msg="Stopping /webnut (4aec2b293b95) with SIGTERM"
watchtower-1  | time="2024-11-26T01:09:57+01:00" level=info msg="Stopping /mosquitto (a29b36b6a28d) with SIGTERM"
watchtower-1  | time="2024-11-26T01:09:58+01:00" level=info msg="Stopping /portainer (d6194e0a3302) with SIGTERM"
watchtower-1  | time="2024-11-26T01:09:59+01:00" level=info msg="Stopping /duplicati (dd055d58cd29) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:03+01:00" level=info msg="Stopping /netbootxyz (1237e479e462) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:07+01:00" level=info msg="Stopping /qbittorrent (61d672d5bd06) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:11+01:00" level=info msg="Stopping /tvheadend (33e5da4e5c93) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:15+01:00" level=info msg="Stopping /zigbee2mqtt (40c77ab8425c) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:25+01:00" level=info msg="Stopping /zwave-js (1918cda3f389) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:31+01:00" level=info msg="Stopping /matter-server (b5e4504b0575) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:33+01:00" level=info msg="Stopping /music-assistant-server (b77fb5f96a73) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:34+01:00" level=info msg="Stopping /esphome (d6933ae18091) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:45+01:00" level=info msg="Stopping /ecowitt2mqtt (7933fdaefc4a) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:46+01:00" level=info msg="Stopping /homeassistant (6915a26f14d5) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:56+01:00" level=info msg="Stopping /node-red (03485a47abbc) with SIGTERM"
watchtower-1  | time="2024-11-26T01:10:57+01:00" level=info msg="Stopping /duckdns (9aee3893b952) with SIGTERM"
watchtower-1  | time="2024-11-26T01:11:01+01:00" level=info msg="Stopping /wikijs (e9cdddf7bb52) with SIGTERM"
watchtower-1  | time="2024-11-26T01:11:02+01:00" level=info msg="Stopping /heimdall (44776c5d5196) with SIGTERM"
watchtower-1  | time="2024-11-26T01:11:06+01:00" level=info msg="Stopping /yt_redis (9d49e61a207a) with SIGTERM"
watchtower-1  | time="2024-11-26T01:11:07+01:00" level=info msg="Stopping /yt_postgres (b4aa8a7ca770) with SIGTERM"
watchtower-1  | time="2024-11-26T01:11:18+01:00" level=info msg="Creating /yt_postgres"
watchtower-1  | time="2024-11-26T01:11:18+01:00" level=info msg="Creating /yt_redis"
watchtower-1  | time="2024-11-26T01:11:18+01:00" level=info msg="Creating /heimdall"
watchtower-1  | time="2024-11-26T01:11:19+01:00" level=info msg="Creating /wikijs"
watchtower-1  | time="2024-11-26T01:11:19+01:00" level=info msg="Creating /duckdns"
watchtower-1  | time="2024-11-26T01:11:20+01:00" level=info msg="Creating /node-red"
watchtower-1  | time="2024-11-26T01:11:20+01:00" level=info msg="Creating /homeassistant"
watchtower-1  | time="2024-11-26T01:11:21+01:00" level=info msg="Creating /ecowitt2mqtt"
watchtower-1  | time="2024-11-26T01:11:21+01:00" level=info msg="Creating /esphome"
watchtower-1  | time="2024-11-26T01:11:22+01:00" level=info msg="Creating /music-assistant-server"
watchtower-1  | time="2024-11-26T01:11:22+01:00" level=info msg="Creating /matter-server"
watchtower-1  | time="2024-11-26T01:11:22+01:00" level=info msg="Creating /zwave-js"
watchtower-1  | time="2024-11-26T01:11:23+01:00" level=info msg="Creating /zigbee2mqtt"
watchtower-1  | time="2024-11-26T01:11:23+01:00" level=info msg="Creating /tvheadend"
watchtower-1  | time="2024-11-26T01:11:25+01:00" level=info msg="Creating /qbittorrent"
watchtower-1  | time="2024-11-26T01:11:25+01:00" level=info msg="Creating /netbootxyz"
watchtower-1  | time="2024-11-26T01:11:26+01:00" level=info msg="Creating /duplicati"
watchtower-1  | time="2024-11-26T01:11:27+01:00" level=info msg="Creating /portainer"
watchtower-1  | time="2024-11-26T01:11:28+01:00" level=info msg="Creating /mosquitto"
watchtower-1  | time="2024-11-26T01:11:28+01:00" level=info msg="Creating /webnut"
watchtower-1  | time="2024-11-26T01:11:29+01:00" level=info msg="Removing image 6ec018434247"
watchtower-1  | time="2024-11-26T01:11:30+01:00" level=info msg="Removing image e3d3628a376f"
watchtower-1  | time="2024-11-26T01:11:37+01:00" level=info msg="Removing image 489a122103aa"
watchtower-1  | time="2024-11-26T01:11:38+01:00" level=info msg="Removing image 9e54ddcf1de6"
watchtower-1  | time="2024-11-26T01:11:39+01:00" level=info msg="Removing image cc4b4dcbb98c"
watchtower-1  | time="2024-11-26T01:11:39+01:00" level=info msg="Removing image 7fe0befae901"
watchtower-1  | time="2024-11-26T01:11:39+01:00" level=info msg="Removing image e105cfd78d67"
watchtower-1  | time="2024-11-26T01:11:39+01:00" level=info msg="Removing image 5850ee0c130f"
watchtower-1  | time="2024-11-26T01:11:40+01:00" level=info msg="Removing image 805a764170c1"
watchtower-1  | time="2024-11-26T01:11:41+01:00" level=info msg="Removing image 9c0b5a6a7e4d"
watchtower-1  | time="2024-11-26T01:11:41+01:00" level=info msg="Removing image 1588fd74f759"
watchtower-1  | time="2024-11-26T01:11:41+01:00" level=info msg="Removing image 55cf87258644"
watchtower-1  | time="2024-11-26T01:11:42+01:00" level=info msg="Removing image 2f9ef2dcaad4"
watchtower-1  | time="2024-11-26T01:11:44+01:00" level=info msg="Removing image 2f9c1eb086b0"
watchtower-1  | time="2024-11-26T01:11:44+01:00" level=info msg="Removing image d25945831d6b"
watchtower-1  | time="2024-11-26T01:11:44+01:00" level=info msg="Removing image d4a3e64ed8ed"
watchtower-1  | time="2024-11-26T01:11:44+01:00" level=info msg="Removing image 47209f56f112"
watchtower-1  | time="2024-11-26T01:11:45+01:00" level=info msg="Removing image 23ae4df962d8"
watchtower-1  | time="2024-11-26T01:11:45+01:00" level=info msg="Removing image 503d40f895e9"
watchtower-1  | time="2024-11-26T01:11:46+01:00" level=info msg="Removing image 089ebd19472c"
watchtower-1  | time="2024-11-26T01:11:47+01:00" level=info msg="Session done" Failed=0 Scanned=31 Updated=20 notify=no
watchtower-1  | time="2024-11-26T01:11:47+01:00" level=error msg="Failed to send shoutrrr notification" error="Message exceeds the max length" index=0 notify=no service=telegram

Additional context

No response

[github-actions]

Hi there! 👋🏼 As you're new to this repo, we'd like to suggest that you read our code of conduct as well as our contribution guidelines. Thanks a bunch for opening your first issue! 🙏

[Elekam]

In case of using pushover for notifications, the message seems to simply be cut off at the API limitation of 1024 4-byte UTF-8 characters, losing the rest of the notifcations entirely.

Maybe some kind of MAX_NOTIFICATION_SIZE Parameter, to split notifcations into enough calls to get the entire notification across would be an idea. I dont know how much of an undertaking to add that would be, probably not insignificant.

[Xav-Pe]

Same problem here.

watchtower  | time="2024-12-19T13:20:51+01:00" level=info msg="Watchtower 1.7.1" notify=no
watchtower  | time="2024-12-19T13:20:51+01:00" level=info msg="Using notifications: telegram" notify=no

...

watchtower  | time="2024-12-26T13:24:07+01:00" level=info msg="Session done" Failed=0 Scanned=37 Updated=13 notify=no
watchtower  | time="2024-12-26T13:24:07+01:00" level=error msg="Failed to send shoutrrr notification" error="Message exceeds the max length" index=0 notify=no service=telegram