Guide

How to set up Slack uptime alerts

Your team lives in Slack. When your API goes down at 2 AM, the alert should show up where people will actually see it. Here's how to wire up uptime monitoring with Slack notifications in under 5 minutes.

STEP 1

Create a monitor

Sign up at app.larm.dev and create an HTTP monitor. Enter the URL you want to watch: your API health endpoint, your marketing site, your dashboard. Larm checks it from multiple global locations using multi-probe voting, so a single network hiccup won't trigger a false alert.

STEP 2

Connect Slack

Go to Alert Channels and add a Slack channel. Larm connects via OAuth. Pick your workspace and channel from the dashboard. No webhook URLs to copy, no bot tokens to manage. Choose the channel your engineering team watches (or create a dedicated #alerts channel).

STEP 3

Attach the channel to your monitor

Link the Slack channel to your monitor. You can also set it as a default so every new monitor you create automatically sends alerts to Slack. When your service goes down, confirmed by multiple probe locations, Slack gets a formatted message with the monitor name, status, and error details.

STEP 4

Send a test alert

Hit "Test" on your Slack channel to verify it works before you need it. You'll see exactly what a real alert looks like in your channel. Better to test now than to find out your Slack token revoked during an actual outage.

Why not just use a simple webhook?

You could set up a cron job that curls your endpoint and posts to a Slack webhook. It would work, until the server running the cron job goes down too. Or until a DNS blip triggers a false alarm at 3 AM. Or until you need to monitor 10 endpoints instead of 1.

Larm checks from multiple locations across multiple continents. A probe failure in one region doesn't become your team's problem. You get confirmation windows that filter out brief blips, full request waterfall traces for debugging, and a status page that updates automatically. The Slack alert is just the notification layer on top of monitoring you can actually trust.

Slack alerts in under 5 minutes.

Free plan. 15 monitors. Multi-probe voting. No credit card.