File

mod_pubsub_alertmanager/README.md @ 5719:66986f5271c3

mod_storage_s3: Skip archive items matching on date but not full datetime Since it only encodes dates in paths, it would have returned items from outside the specified start..end range if they were from earlier or later in the same (UTC) day.
author Kim Alvefur <zash@zash.se>
date Sat, 11 Nov 2023 22:26:39 +0100
parent 5485:67190744b1eb
line wrap: on
line source

---
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}"`

`alertmanager_path_configs`
:   Per-path configuration variables (see below).

### Per-path configuration

It's possible to override configuration options based on the path suffix. For
example, if a request is made to `http://prosody/pubsub_alertmanager/foo` the
path suffix is `foo`. You can then supply the following configuration:

``` lua
alertmanager_path_configs = {
    foo = {
        node_template = "alerts/{alert.labels.severity}";
        publisher = "user@example.net";
    };
}
```