Request: Add topic_id as an optional parameter to telegram_config

[instantdreams]

What did you do?
Configured Alertmanager to use Telegram notifications, and set the chat_id to be a group.

What did you expect to see?
The ability to set a topic_id to target a particular topic.

What did you see instead? Under which circumstances?
Messages go to first topic, usually General.

Environment

• System information:
  Linux 6.1.0-17-amd64 x86_64

• Alertmanager version:
  alertmanager, version 0.26.0 (branch: HEAD, revision: d7b4f0c)
  build user: root@df8d7debeef4
  build date: 20230824-11:11:58
  go version: go1.20.7
  platform: linux/amd64
  tags: netgo

• Prometheus version:
  prometheus, version 2.49.1 (branch: HEAD, revision: 43e14844a33b65e2a396e3944272af8b3a494071)
  build user: root@6d5f4c649d25
  build date: 20240115-16:58:43
  go version: go1.21.6
  platform: linux/amd64
  tags: netgo,builtinassets,stringlabels

• Alertmanager configuration file:

global:
  resolve_timeout: 10m

route:
  group_by: ['alertname']
  group_wait: 30s
  group_interval: 30s
  repeat_interval: 5m
  receiver: 'id-telegram'

receivers:
- name: 'id-telegram'
  telegram_configs:
  - api_url: https://api.telegram.org
    bot_token: $BOT_TOKEN
    chat_id: $CHAT_ID
    send_resolved: true

• Prometheus configuration file:

global:
  scrape_interval:     15s
  evaluation_interval: 15s

alerting:
  alertmanagers:
  - static_configs:
    - targets: ['[host-ip]:[port}']

rule_files:
  - 'alert.yml'

scrape_configs:
  - [various-configurations]

• Logs:
  n/a

• Notes:
  My logging stack is working well, but I would very much like to be able to target a particular topic in Telgram.

[Scealang]

Hello, I agree that alertmanager need this feature.

[efajunk]

There is no topic_id in telegram api. We have to add reply_to_message_id in GET request. When we reply to message "The topic "sometopic" was created" we actually send a message into this topic. I guess we should begin with:

	DisableNotifications bool   `yaml:"disable_notifications,omitempty" json:"disable_notifications,omitempty"`
	ParseMode            string `yaml:"parse_mode,omitempty" json:"parse_mode,omitempty"`
	ReplyToMessageID     int64  `yaml:"reply_to_message_id,omitempty" json:"reply_to_message_id,omitempty"`
}

efajunk/alertmanager@main...efajunk-patch-1

[we1rdw4y]

Field is called message_thread_id
https://core.telegram.org/bots/api#sendmessage

#3332

[instantdreams]

Recommendation to implement message_thread_id and update <telegram_config> to include:

# ID of the message thread (topic) of the forum; for groups (optional)
[ message_thread_id [<int>](https://prometheus.io/docs/alerting/latest/configuration/#int) ]

[grobinson-grafana]

There are two open PRs for this #3560 and #3638.

[Ryan-DL]

@grobinson-grafana We've had a few different PRs around this, and its very important to support this functionality. Right now we're in a world where everything is routed to the telegram equivalent of a #general chat on Slack with no ability to change the routing to avoid going to the whole organization.

I think #3672 is ready to go to alleviate this issue.

[grobinson-grafana]

I'm working with @th0th on #3638. Please follow that PR for updates.

[grobinson-grafana]

Hi! 👋 #3638 has been merged! You can close the issue 🙂