I have my Telegram bot deployed to GCP cloud run. It works fine even when instances get scaled to 0 – when Telegram calls, the instance starts and the bot receives the updates.

But sometimes, in unknown circumstances:

• I send a message to the bot
• No requests I have in GCP
• The instances don’t scale

What’s interesting is that if I call the getWebhookInfo method:

{
  "ok": true,
  "result": {
    "url": "https://my-host/telegram/webhook",
    "has_custom_certificate": false,
    "pending_update_count": 0,
    "max_connections": 40,
    "ip_address": "35.000.00.000",
    "allowed_updates": [
      "message"
    ]
  }
}

Then Telegram does send updates right after my call, kinda when I remind about myself. Imagine the case:

• No pending updates
• Write a message to the bot
• No requests, no logs, no events in GCP
• Wait a long period of N hours
• call getWebhookInfo
• it returns pending update 1 and calls me

What can be wrong?

I don’t have any firewall rule other than default.

The certificate is okay as it’s managed by Google.

I tried with a static IP (load balancer) and w/o – same case.

I thought it’s about "allowed_updates": [ "message" ] but no – it’s set now always and no updates.