---
title: "How does the Alert Rules builder work? — Lemwatch Help"
description: "The Alert Rules builder lets you compose conditions (metric + operator + threshold + duration) and route matching alerts to specific channels."
canonical: "https://lemwatch.com/help/alert-rules-builder-overview"
source: "https://lemwatch.com"
---

# How does the Alert Rules builder work?

> The Alert Rules builder lets you compose conditions (metric + operator + threshold + duration) and route matching alerts to specific channels.

## Quick answer

 Open **Settings → Alerts → Rules**, click **New rule**, pick a metric (uptime, response time, SSL, visual, SEO), set an operator + threshold + duration, then choose which channels the rule fires to. Rules evaluate on every check.

## What it does

- Composable IF/THEN alert logic per site or across the fleet

- Combines multiple conditions with AND / OR

- Scopes rules to a site, tag, or organisation

- Overrides default notification routing per rule

- Supports quiet hours and dedupe windows

## Where to find it in Lemwatch

 **Settings → Alerts → Rules**.

## How to build a rule

- Click New rule and name it (e.g. "Slow checkout").

- Pick a metric (e.g. response time on /checkout).

- Set operator + threshold + duration ("> 3s for 5 min").

- Add scope (site, tag, or all sites).

- Choose channels (email, Slack, webhook) and hit Save .

## FAQ

### Do rules replace the default alerts?

 No — rules add to defaults. Mute defaults per site if you only want rule-based alerts.

### Is there a rule limit?

 Pro: 25 rules. Agency: 100. LTD Tier 3: unlimited.

## Related

- Alert rule conditions and operators

- Alert rule routing and suppression

- Notification preferences


## Related

- [Help centre](https://lemwatch.com/help)
- [What conditions and operators can I use in Alert Rules?](https://lemwatch.com/help/alert-rule-conditions-and-operators)
- [How do I route and suppress alerts from a rule?](https://lemwatch.com/help/alert-rule-routing-and-suppression)
- [How do I set my notification preferences?](https://lemwatch.com/help/notification-preferences)
- [Lemwatch pricing](https://lemwatch.com/pricing)
- [Setting Up Alerts](https://lemwatch.com/help/alert-setup)