Alerting: Add warning in telegram contact point (#89397)
* Add warning in telegram contact point * Protect possible undefined in settings * Address review comments
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@@ -22,6 +22,11 @@ Use the Grafana Alerting - Telegram integration to send [Telegram](https://teleg
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## Before you begin
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### Telegram limitation
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Telegram messages are limited to 4096 UTF-8 characters. If you use a `parse_mode` other than `None`, truncation may result in an invalid message, causing the notification to fail.
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For longer messages, we recommend using an alternative contact method.
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### Telegram bot API token and chat ID
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To integrate Grafana with Telegram, you need to obtain a Telegram **bot API token** and a **chat ID** (i.e., the ID of the Telegram chat where you want to receive the alert notifications).
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