source: Alerting/index.md
Table of Content:

- [About](#about)
- [Rules](Rules.md)
    - [Syntax](Rules.md#syntax)
    - [Options](Rules.md#options)
    - [Examples](Rules.md#examples)
    - [Procedure](Rules.md#procedure)
- [Templates](Templates.md)
    - [Syntax](Templates.md#syntax)
    - [Testing](Templates.md#testing)
    - [Examples](Templates.md#examples)
    - [Included](Templates.md#included)
- [Transports](Transports.md)
    - [E-Mail](Transports.md#e-mail)
    - [API](Transports.md#api)
    - [Nagios-Compatible](Transports.md#nagios-compatible)
    - [IRC](Transports.md#irc)
    - [Slack](Transports.md#slack)
    - [Rocket.chat](Transports.md#rocketchat)
    - [HipChat](Transports.md#hipchat)
    - [PagerDuty](Transports.md#pagerduty)
    - [Pushover](Transports.md#pushover)
    - [Boxcar](Transports.md#boxcar)
    - [Telegram](Transports.md#telegram)
    - [Pushbullet](Transports.md#pushbullet)
    - [Clickatell](Transports.md#clickatell)
    - [PlaySMS](Transports.md#playsms)
    - [VictorOps](Transports.md#victorops)
    - [Canopsis](Transports.md#canopsis)
    - [osTicket](Transports.md#osticket)
    - [Microsoft Teams](Transports.md#microsoftteams)
    - [Cisco Spark](Transports.md#ciscospark)
    - [SMSEagle](Transports.md#smseagle)
    - [Syslog](Transports.md#syslog)
    - [Elasticsearch](Transports.md#elasticsearch)
    - [Jira](Transports.md#jira)
    
- [Entities](Entities.md)
    - [Devices](Entities.md#devices)
    - [BGP Peers](Entities.md#bgppeers)
    - [IPSec Tunnels](Entities.md#ipsec)
    - [Memory Pools](Entities.md#entity-mempools)
    - [Ports](Entities.md#entity-ports)
    - [Processors](Entities.md#entity-processors)
    - [Storage](Entities.md#entity-storage)
    - [Sensors](Entities.md#entity-sensors)
- [Macros](Macros.md)
    - [Device](Macros.md#macros-device)
    - [Port](Macros.md#macros-port)
    - [Time](Macros.md#macros-time)
    - [Sensors](Macros.md#macros-sensors)
    - [Misc](Macros.md#macros-misc)


# About

LibreNMS includes a highly customizable alerting system.
The system requires a set of user-defined rules to evaluate the situation of each device, port, service or any other entity.

> You can configure all options for alerting and transports via the WebUI, config options in this document are crossed out but left for reference.