FastAPI + Telegram: Building a Real-Time Alert Bot in 30 Minutes

The provided Python script sets up a FastAPI server to receive alert notifications and send them via Telegram. This is useful for integrating monitoring systems like Prometheus with Telegram, allowing users to get immediate alerts on their mobile devices.

Here's a breakdown of the key components:

1. Environment Variables: The script uses environment variables (TELEGRAM_BOT_TOKEN, TELEGRAM_CHAT_ID) to configure the Telegram bot and where messages should be sent. It also expects an API secret (YOUR_SECRET_HERE).

2. FastAPI Setup:

   • A FastAPI application is created.
   • An asynchronous HTTP client using httpx.AsyncClient is set up for making requests to the Telegram Bot API.

3. Alert Handling Functionality:

   • The /alert/{secret} endpoint receives alert data as JSON and sends it via Telegram if the provided secret matches an expected value.
   • It handles retries with exponential backoff in case of rate limiting (HTTP 429 status code).

4. Health Check:

   • A simple health check endpoint (/health) is implemented to verify that the bot is properly configured and running.

5. Error Handling:

   • The script includes robust error handling

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