# [ntfy-alertmanager]

[![builds.sr.ht status](https://builds.xenrox.net/~xenrox/ntfy-alertmanager/commits/master.svg)](https://builds.xenrox.net/~xenrox/ntfy-alertmanager/commits/master?)

A bridge between ntfy and Alertmanager.

## Installation

Simply use go build or the [docker image] with [docker-compose file].
`ntfy-alertmanager:latest` is built from the latest tagged release while
`ntfy-alertmanager:dev` is built from the master branch.

## Configuration

You can specify the configuration file location with the `--config` flag. By default
the configuration file will be read from `/etc/ntfy-alertmanager/config`. The format
of this file is [scfg].

ntfy-alertmanager has support for setting ntfy [priority], [tags], [icon] and [action buttons]
(which can be used to create an Alertmanager silence).
Define a decreasing order of labels in the config file and map those labels to tags, priority or an icon.

-   For priority and icon the first found value will be chosen. An icon for "resolved" alerts will take precedence.
-   Tags are added together.

Example:

```
# Public facing base URL of the service (e.g. https://ntfy-alertmanager.xenrox.net)
# This setting is required for the "Silence" feature.
base-url https://ntfy-alertmanager.xenrox.net
# http listen address
http-address :8080
# Log level (either debug, info, warning, error)
log-level info
# When multiple alerts are grouped together by Alertmanager, they can either be sent
# each on their own (single mode) or be kept together (multi mode) (either single or multi; default is single)
alert-mode single
# Optionally protect with HTTP basic authentication
user webhookUser
password webhookPass

labels {
    order "severity,instance"

    severity "critical" {
        priority 5
        tags "rotating_light"
        icon "https://foo.com/critical.png"
    }

    severity "info" {
        priority 1
    }

    instance "example.com" {
        tags "computer,example"
    }
}

# Settings for resolved alerts
resolved {
    tags "resolved,partying_face"
    icon "https://foo.com/resolved.png"
}

ntfy {
    # URL of the ntfy topic - required
    topic https://ntfy.sh/alertmanager-alerts
    # ntfy authentication via Basic Auth (https://docs.ntfy.sh/publish/#username-password)
    user user
    password pass
    # ntfy authentication via access tokens (https://docs.ntfy.sh/publish/#access-tokens)
    # Either access-token or a user/password combination can be used - not both.
    access-token foobar
}

alertmanager {
    # If set, the ntfy message will contain a "Silence" button, which can be used
    # to create a silence via the Alertmanager API. Because of limitations in ntfy,
    # the request will be proxied through ntfy-alertmanager. Therefore ntfy-alertmanager
    # needs to be exposed to external network requests and base-url has to be set.
    #
    # When alert-mode is set to "single" all alert labels will be used to create the silence.
    # When it is "multi" common labels between all the alerts will be used. WARNING: This
    # could silence unwanted alerts.
    silence-duration 24h
    # Basic authentication (https://prometheus.io/docs/alerting/latest/https/)
    user user
    password pass
    # By default the Alertmanager URL gets parsed from the webhook. In case that
    # Alertmanger is not reachable under that URL, it can be overwritten here.
    url https://alertmanager.xenrox.net
}

# When the alert-mode is set to single, ntfy-alertmanager will cache each single alert
# to avoid sending recurrences.
cache {
    # The type of cache that will be used (either memory or redis; default is memory).
    type memory
    # How long messages stay in the cache for
    duration 24h

    # Memory cache settings
    # Interval in which the cache is cleaned up
    cleanup-interval 1h

    # Redis cache settings
    # URL to connect to redis (default: redis://localhost:6379)
    redis-url redis://user:password@localhost:6789/3
}
```

### Alertmanager config

```yaml
receivers:
    - name: "ntfy"
      webhook_configs:
          - url: "http://127.0.0.1:8080"
            http_config:
                basic_auth:
                    username: "webhookUser"
                    password: "webhookPass"
```

## Contributing

Report bugs on the [issue tracker].

[ntfy-alertmanager]: https://hub.xenrox.net/~xenrox/ntfy-alertmanager/
[scfg]: https://git.sr.ht/~emersion/scfg
[priority]: https://ntfy.sh/docs/publish/#message-priority
[tags]: https://ntfy.sh/docs/publish/#tags-emojis
[icon]: https://docs.ntfy.sh/publish/#icons
[action buttons]: https://docs.ntfy.sh/publish/#action-buttons
[issue tracker]: https://todo.xenrox.net/~xenrox/ntfy-alertmanager
[docker image]: https://hub.docker.com/r/xenrox/ntfy-alertmanager
[docker-compose file]: https://git.xenrox.net/~xenrox/ntfy-alertmanager/tree/master/item/docker/docker-compose.yml