Telegram notifications for PM2 process manager

• 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!)

• (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

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

• 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.

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!

• 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

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

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

Use set operator without a value to reset option.

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

pm2 install pm2-telegram@latest

Welcome to GitHub Issues!

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