pm2-telegram

Telegram notifications for PM2 process manager

Functions

• collect desired messages to buffer then send collected messages every 10 seconds
• allow messages scope selection (errors, logs, exceptions and kill events)
• truncate long messages (longer than Telegram limitation 4096 characters) to avoid send error
• combine short messages to one message (the resultant big message shorter than 4096 characters) to avoid impact of Telegram messages frequency limitation (see: My bot is hitting limits, how do I avoid this?)
• set message title for pm2-telegram instance to distinguish messages from one Telegram bot installed on many instances (default is server hostname)
• format messages for better viewing (be aware to face with Markdown characters in raw notification text!)

Examples

Unformatted

Formatted

Roadmap

• (under development) option to split long messages to many continuous messages (you should choose truncate or split big messages)
• (under development) option to display real message's timestamp and set timestamp format (HH:mm:ss.SSS)
• (under development) control messages buffer overflow, reset it and send buffer overflow notification

Setup

Create bot

• create a Telegram bot with Telegram's BotFather (look at Telegram documentation)
• get BOT_TOKEN from BotFather's answer

Get chat id

• add the bot to a group if you want to send notifications to a group
• send message from group to the bot: /test Hello bot! (use any command-like message started by slash)
• open sent message at https://api.telegram.org/bot<BOT_TOKEN>/getUpdates

{
    "ok": true,
    "result": [{
            "update_id": 123456789,
            "message": {
                "message_id": 1,
                "from": {
                    "id": 223322223322,
                    "is_bot": false,
                    "first_name": "Hildur",
                    "last_name": "Bock",
                    "username": "fröken_bock"
                },
                "chat": {
                    "id": -76543210, // <- this is chat_id!
                    "title": "Buns_Eaters",
                    "type": "group",
                    "all_members_are_administrators": false
                },
                "date": 1649627436,
                "text": "/test Hello bot!",
                "entities": [{
                        "offset": 0,
                        "length": 5,
                        "type": "bot_command"
                    }
                ]
            }
    }]
}

CHAT_ID is on result.message.chat.id property.

Notice:

If you in the first created a group with only you and a bot, but later you'll add a second real user chat.id could be changed by Telegram. Check chat.id after add the second real user!

Start module

• install the module: pm2 install pm2-telegram
• set the bot token: pm2 set pm2-telegram:bot_token <BOT_TOKEN>
• set chat id: pm2 set pm2-telegram:chat_id <CHAT_ID>

For a group's chat id prepend it by g- to isolate minus sign, eg:
group chat CHAT_ID = -76543210 -> g-76543210
personal chat CHAT_ID = 123456789 -> 123456789

Configure notifications

• to set any option use: pm2 set pm2-telegram:<OPTION_NAME> <OPTION_VALUE>

Notification options

option name	default	description
error	true	console.error() and console.warn()
log	false	console.log()
kill	true	kill PM2 process
exception	true	exception in PM2 process

Module behavior options

option name	default	description
collate	true	combine short messages to one Telegram message

Module description options

option name	default	description
title	server host name	messages title (could be used for set server name)
text_format	undefined	'Markdown' to format messages (be careful if your messages could have Markdown format characters - there'll lost them)

Full configuration example

pm2 set pm2-telegram:title OnTheRoof
pm2 set pm2-telegram:bot_token 223322223322:ABCDefghIJKLmnop12345rStUvWxYz67890
pm2 set pm2-telegram:chat_id g-76543210
pm2 set pm2-telegram:error true
pm2 set pm2-telegram:text_format Markdown
pm2 install pm2-telegram

Reset option

Use set operator without a value to reset option.

For example to clear text_format option value use: pm2 set pm2-telegram:text_format

Upgrade module to the latest version

pm2 install pm2-telegram@latest

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Notices

Bugs and feature requests

Welcome to GitHub Issues!

Thanks for some ideas to:

• shubhroshekhar (author of pm2-telegram-notification)
• korolyov88 (author of pm2-telegram-notify)

Releases

version	changes
0.2.4	• fix: remove extra debug message
0.2.3	• docs: remove documentation images from project
0.2.2	• docs: documentation corrections
0.2.1	• docs: minimize example's image files size
0.2.0	• feature: add option text_format to format notification messages • fix: mistaken truncate messages on & character
0.1.12	• docs: documentation update
0.1.11	• feature: set default title as local server hostname (on upgrade don't forget to call pm2 set pm2-telegram:title with empty value to reset value stored in PM2 'title' variable)
0.1.10	• docs: documentation update
0.1.9	• fix: message type missed in notification title ('error', 'exception' etc.) and in messages delimiters (new lines)
0.1.8	• fix: error on send exception message (message is 'undefined')