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108 lines
6.0 KiB
Markdown
108 lines
6.0 KiB
Markdown
# Setting up matrix-alertmanager-receiver (optional)
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The playbook can install and configure the [matrix-alertmanager-receiver](https://github.com/metio/matrix-alertmanager-receiver) service for you. It's a [client](https://prometheus.io/docs/alerting/latest/clients/) for Prometheus' [Alertmanager](https://prometheus.io/docs/alerting/latest/alertmanager/), allowing you to deliver alerts to Matrix rooms.
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See the project's [documentation](https://github.com/metio/matrix-alertmanager-receiver) to learn more about what this component does and why it might be useful to you.
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At the moment, **setting up this service's bot requires some manual actions** as described below in [Account and room preparation](#account-and-room-preparation).
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This service is meant to be used with an external [Alertmanager](https://prometheus.io/docs/alerting/latest/alertmanager/) instance. It's **not** meant to be integrated with the [Prometheus & Grafana stack](./configuring-playbook-prometheus-grafana.md) installed by this playbook, because the Alertmanager component is not installed by it.
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## Adjusting the playbook configuration
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To enable matrix-alertmanager-receiver, add the following configuration to your `inventory/host_vars/matrix.example.com/vars.yml` file:
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```yml
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matrix_alertmanager_receiver_enabled: true
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# If you'd like to change the username for this bot, uncomment and adjust. Otherwise, remove.
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# matrix_alertmanager_receiver_config_matrix_user_id_localpart: "bot.alertmanager.receiver"
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# Specify the bot user's access token here.
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# See the "Account and room preparation" section below.
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matrix_alertmanager_receiver_config_matrix_access_token: ''
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# Optionally, configure some mappings (URL-friendly room name -> actual Matrix room ID).
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#
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# If you don't configure mappings, you can still deliver alerts using URLs like this:
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# https://matrix.example.com/matrix-alertmanager-receiver-RANDOM_VALUE_HERE/alert/!some-room-id:example.com
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#
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# If a mapping like the one below is configured, you can deliver alerts using friendlier URLs like this:
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# https://matrix.example.com/matrix-alertmanager-receiver-RANDOM_VALUE_HERE/alert/some-room-name
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matrix_alertmanager_receiver_config_matrix_room_mapping:
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some-room-name: "!some-room-id:{{ matrix_domain }}"
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```
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See `roles/custom/matrix-alertmanager-receiver/defaults/main.yml` for additional configuration variables.
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### Adjusting the matrix-alertmanager-receiver URL
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By default, this playbook installs matrix-alertmanager-receiver on the `matrix.` subdomain, at the `/matrix-alertmanager-receiver` path (https://matrix.example.com/matrix-alertmanager-receiver). This makes it easy to install it, because it **doesn't require additional DNS records to be set up**. If that's okay, you can skip this section.
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By tweaking the `matrix_alertmanager_receiver_hostname` and `matrix_alertmanager_receiver_path_prefix` variables, you can easily make the service available at a **different hostname and/or path** than the default one.
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Example additional configuration for your `inventory/host_vars/matrix.example.com/vars.yml` file:
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```yaml
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# Change the default hostname and path prefix
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matrix_alertmanager_receiver_hostname: alertmanager.example.com
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matrix_alertmanager_receiver_path_prefix: /
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```
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## Adjusting DNS records
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If you've changed the default hostname, **you may need to adjust your DNS** records to point the matrix-alertmanager-receiver domain to the Matrix server.
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See [Configuring DNS](configuring-dns.md) for details about DNS changes.
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If you've decided to use the default hostname, you won't need to do any extra DNS configuration.
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## Account and room preparation
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The playbook can automatically create users, but it cannot automatically obtain access tokens, nor perform any of the other manual actions below.
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`matrix-alertmanager-receiver` uses a bot (with a username specified in `matrix_alertmanager_receiver_config_matrix_user_id_localpart` - see above) for delivering messages. You need to **manually register this bot acccount and obtain an access token for it**.
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1. [Register a new user](registering-users.md): `ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=bot.alertmanager.receiver password=PASSWORD_FOR_THE_BOT admin=no' --tags=register-user`
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2. [Obtain an access token](obtaining-access-tokens.md) for the bot's user account
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3. Invite the bot to a room where you'd like to alerts to be delivered
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4. Log in as the bot using any Matrix client of your choosing, accept the room invitation from the bot's account and log out
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5. (Optionally) Adjust `matrix_alertmanager_receiver_config_matrix_room_mapping` to create a mapping between the new room and its ID
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Steps 1 and 2 above only need to be done once, while preparing your [configuration](#adjusting-the-playbook-configuration).
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Steps 3 and 4 need to be done for each new room you'd like the bot to deliver alerts to. Step 5 is optional and provides cleaner `/alert/` URLs.
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## Installing
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Now that you've [prepared the bot account and room](#account-and-room-preparation), [configured the playbook](#adjusting-the-playbook-configuration), and potentially [adjusted your DNS records](#adjusting-dns-records), you can run the [installation](installing.md) command: `just install-all`
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Then, you can proceed to [Usage](#usage).
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## Usage
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Configure your Prometheus Alertmanager with configuration like this:
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```yml
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receivers:
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- name: matrix
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webhook_configs:
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- send_resolved: true
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url: URL_HERE
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route:
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group_by:
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- namespace
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group_interval: 5m
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group_wait: 30s
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receiver: "matrix"
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repeat_interval: 12h
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routes:
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- receiver: matrix
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```
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.. where `URL_HERE` looks like `https://matrix.example.com/matrix-alertmanager-receiver-RANDOM_VALUE_HERE/alert/some-room-name` or `https://matrix.example.com/matrix-alertmanager-receiver-RANDOM_VALUE_HERE/alert/!some-room-id:example.com`.
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This bot does **not** accept room invitations automatically (like many other bots do). To deliver messages to rooms, **the bot must be joined to all rooms manually** - see Step 5 of the [Account and room preparation](#account-and-room-preparation) section.
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