view mod_pubsub_alertmanager/README.md @ 5243:d5dc8edb2695

mod_http_oauth2: Use more compact IDs UUIDs are nice but so verbose! The reduction in entropy for the nonce should be fine since the timestamp is also counts towards this, and it changes every second (modulo clock shenanigans), so the chances of someone managing to get the same client_secret by registering with the same information at the same time as another entity should be negligible.
author Kim Alvefur <zash@zash.se>
date Sat, 11 Mar 2023 22:46:27 +0100
parents eba7e68120d8
children 67190744b1eb
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---
labels:
- 'Stage-Alpha'
summary: Alertmanager webhook receiver for pubsub
---

# Introduction

This module lets
[Alertmanager](https://prometheus.io/docs/alerting/latest/alertmanager/)
publish alerts to [pubsub][doc:pubsub] via
[webhooks](https://prometheus.io/docs/alerting/latest/configuration/#webhook_config).

# Setup

The relevant pubsub nodes must be created and configured somehow.
Because the request IP address is used to publish, the `publisher`
affiliation should be given to the IP address Alertmanager sends
webhooks from.

# Configuration

## Prometheus

A Prometheus `rule_files` might contain something along these lines:

``` yaml
groups:
- name: Stuff
  rules:
  - alert: Down
    expr: up == 0
    for: 5m
    annotations:
      title: 'Stuff is down!'
    labels:
      severity: 'critical'
```

## Alertmanager
On the Alertmanager site the webhook configuration may look something
like this:

``` yaml
receivers:
- name: pubsub
  webhook_configs:
  - url: http://pubsub.localhost:5280/pubsub_alertmanager
```

And then finally some Alertmanager routes would point at that receiver:

``` yaml
route:
  receiver: pubsub
```

## Prosody

On the Prosody side, apart from creating and configuring the node(s)
that will be used, configure your pubsub service like this:

``` lua
Component "pubsub.example.com" "pubsub"
modules_enabled = {
    "pubsub_alertmanager",
}

-- optional extra settings:
alertmanager_body_template = [[
*ALARM!* {annotations.title?Alert} is {status}
Since {startsAt}{endsAt& until {endsAt}}
Labels: {labels%
  {idx}: {item}}
Annotations: {annotations%
  {idx}: {item}}
]]

alertmanager_node_template = "alerts/{alert.labels.severity}"
```

If no node template is given, either an optional part after
"pubsub_alertmanager" in the HTTP path is used as node, or the string
"alerts". Here, an alerts would be published to different nodes based on
the 'severity' label, so e.g. `alerts/critical` in this example.

## All Options

Available configuration options:

`alertmanager_body_template`
:   Template for the textual representation of alerts.

`alertmanager_node_template`
:   Template for the pubsub node name, defaults to `"{path?alerts}"`