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# Mimir Integration
[Mimir](https://grafana.com/oss/mimir/) is an open source, horizontally scalable, highly available, multi-tenant TSDB for long-term storage for Prometheus. The Mimir integration allows you to send Prometheus-compatible alerts, such as metric threshold breaches or anomaly detections, into ilert. These alerts are routed to on-call teams, triggering structured escalation paths to ensure timely resolution of performance and reliability issues in large-scale environments.
{% hint style="info" %}
You can use our [example prometheus setup](https://github.com/iLert/prometheus-integration-docs) to test the Mimir integration
{% endhint %}
## In ilert
## Create a Mimir alert source
1. Go to **Alert sources** -> **Alert sources** and click on **Create new alert source**\\
1. Search for **Mimir** in the search field, click on the Mimir tile, and click on **Next**. \\
2. Give your alert source a name, optionally assign teams, and click **Next**.
3. Select an **escalation policy** by creating a new one or assigning an existing one.\\
4. Select your [Alert grouping](https://docs.ilert.com/alerting/configure-alerting/alert-sources#alert-grouping) preference and click **Continue setup**. You may click **Do not group alerts** for now and change it later. \\
5. The next page shows additional settings such as customer alert templates or notification prioritiy. Click on **Finish setup** for now.
6. On the final page, a Mimir URL will be generated that you will need later in this guide.
## In Prometheus Alertmanager
> In order to be able to use mimir alerts and receive notifications, you need first configure and start alertmanager
1. Install Prometheus Alertmanager in any way that suits your needs. For more information about the alertmanager installation process please visit
2. Configure Alertmanager receivers in order to inform ilert every time there's an alert. In the example below replace the previously created Mimir URL:
{% code title="alertmanager.yaml" lineNumbers="true" %}
```yaml
receivers:
- name: "ilert"
webhook_configs:
- url: ""
send_resolved: true
```
{% endcode %}
{% hint style="info" %}
You could also split alert to high and low priority by creating two alert sources accordingly
{% endhint %}
## In Mimir
1. Install Mimir in any way that suits your needs.
2. Configure the Mimir alert rules in order to trigger alerts regarding the rule expression. For example:
{% code title="mimir-alert-rules.yaml" lineNumbers="true" %}
```yaml
groups:
- name: mimir-critical
rules:
- alert: MimirIngesterUnhealthy
expr: |
min by (cluster, namespace) (cortex_ring_members{state="Unhealthy", name="ingester"}) > 0
for: 15m
labels:
severity: critical
annotations:
summary: Mimir cluster has unhealthy ingesters alert
description: "Mimir cluster has unhealthy ingesters \n VALUE = {{ $value }}\n LABELS = {{ $labels }}"
```
{% endcode %}
3. Configure the Mimir ruler to send alerts to an external alertmanager and point the alert rules folder:
## FAQ
**Will alerts in ilert be resolved automatically?**
Yes, as soon as the Alertmanager sends a "RESOLVE" event, the associated alert is automatically resolved in ilert.
