hostnag

Uptime and certificate alerts in Telegram

hostnag messages a Telegram bot for every alert, with links inline.

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Included on Pro and Business.

PlansFreeProBusiness

Down

Message
[Critical] https://www.example.com/ is down

Down from 2 of 3 locations (US East, Frankfurt). Last error: unexpected_status: 503.

Group: Client A
Monitor: Marketing site
Target: https://www.example.com/
Down since: 12 Sept 2026, 07:58 UTC
Locations: US East, Frankfurt
Status code: 503
Last error: unexpected_status: 503

Acknowledge  Open monitor
Length
348 of 4096 characters

Set up

  1. 01

    Create a bot

    Message @BotFather, create a bot, and copy the token it gives you.

  2. 02

    Add the bot and the chat id

    Add the bot to the chat, then paste its token and the chat id; a group chat id starts with a minus, or use a public @channel name.

What arrives

Rendered by the same code that sends it.

Back up

Message
[Recovered] https://www.example.com/ is back up after 1 h 15 min

https://www.example.com/ answered again from every location. It was down for 1 h 15 min.

Group: Client A
Monitor: Marketing site
Target: https://www.example.com/
Down since: 12 Sept 2026, 07:58 UTC
Duration: 1 h 15 min

Acknowledge  Open monitor
Length
312 of 4096 characters

Recovered

Message
[Recovered] api.example.com certificate renewed

The certificate for api.example.com is healthy again and now expires 10 Dec 2026.

Group: Client A
Monitor: API
Target: api.example.com
Expires: 10 Dec 2026
Issuer: Let's Encrypt R11

Acknowledge  Open monitor
Length
258 of 4096 characters

Routing

Every alert follows the group's alert policy: which channels a route goes to and the minimum severity each one takes, in bands of critical, warning and info. Quiet hours hold non-critical alerts for email, Slack, Discord, SMS, Teams and Telegram until the window closes, then deliver one digest; critical alerts are never held, and webhook, PagerDuty and Opsgenie always deliver right away since they hand off to another machine, not a person. A maintenance window on a group or a monitor suppresses alerts for its duration while checks keep running. An alert nobody acknowledges escalates through up to three tiers, each after its own number of minutes, and can be acknowledged with one tap from the alert message itself.

Questions

What if my chat is a public channel instead of a group?

Use its @name instead of a numeric chat id; hostnag accepts either.

Are links clickable in the message?

Yes. Open monitor is always a plain link; Acknowledge appears the same way, but only when the alert can be acknowledged.

Watches

Alerting and status pagesEvery alert routed to the right channel at the right severity, held during quiet hours and maintenance, escalated until it's acknowledged.Uptime monitoringWebsites, APIs and anything that answers on a port, checked every minute from up to four places, with a failure confirmed before anyone is paged.

Add a host. Hear about it in Telegram.

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