Apprise Notifications for Checkmk

Send Checkmk host and service notifications to an Apprise API server and let Apprise handle the final routing to your notification services.

This extension adds a native Apprise notification method to Checkmk Setup. Checkmk sends a provider-independent notification to Apprise, while destinations such as Signal, Matrix, Discord, Slack, Gotify, email and other services remain configured centrally in Apprise.

Features

• Native Checkmk notification method and Setup form
• Checkmk 2.5.x
• Host and service notifications
• Problem and recovery notifications
• Acknowledgements
• Downtime start, end and cancellation
• Flapping and custom notifications
• Apprise tag-based routing
• HTTP Basic authentication
• Checkmk Password Store support
• Plain text and rich-text messages
• TLS certificate verification enabled by default
• Optional private CA certificate
• Configurable request timeout
• Checkmk-native retry behavior for temporary delivery failures
• No Apprise package or additional Python dependencies required on the Checkmk server

Requirements

• Checkmk 2.5.x
• Apprise API with Apprise 2.0 or newer
• A saved Apprise configuration reachable from the Checkmk site

The extension uses the stateful Apprise API endpoint:

POST /notify/{config_id}

Provider configuration stays entirely on the Apprise side.

Routing

A Checkmk notification rule can optionally pass an Apprise tag expression.

For example:

• ops
• network
• ops night
• ops, oncall

This makes it possible to use Checkmk rules for deciding when a notification is generated while Apprise decides where it is delivered.

Security

• TLS verification is enabled by default.
• Private CA certificates are supported and must reside inside the Checkmk site directory.
• Credentials can be stored in the Checkmk Password Store.
• Credentials, server URL, configuration ID and response bodies are not written to notification output.
• Redirects and environment proxies are intentionally not used.

Compatibility

Verified with:

• Checkmk 2.5.x
• Checkmk Community Edition
• Checkmk Enterprise Edition
• Python 3.13 on the Checkmk site
• Apprise 2.0
• End-to-end delivery through Apprise to Signal

The MKP declares compatibility with Checkmk 2.5.x only.

Installation

Install the MKP and enable it, then create a notification rule using the Apprise notification method.

No additional Python modules are required on the Checkmk server.

Full installation, configuration and troubleshooting documentation is available in the project repository:

https://github.com/Django1982/CheckMK_Apprise_MKP

License

GPL-2.0-only