# Connect to an Alertmanager data source
<a name="data-source-alertmanager"></a>

Grafana includes built-in support for Prometheus Alertmanager. Once Grafana alerting is configured, you can use the Grafana alerting UI to manage silences, contact points as well as notification policies. A drop-down option in these pages allows you to switch between Grafana and any configured Alertmanager data sources.

**Alertmanager implementations**

[Prometheus](https://prometheus.io/), [Cortex](https://cortexmetrics.io/), and [Grafana Mimir](https://grafana.com/docs/mimir/latest/) implementations of Alertmanager are supported. You can specify implementation in the data source settings page. Prometheus contact points and notification policies are read-only in the Grafana alerting UI, as it does not support updating configuration via HTTP API.

## Configuring an Alertmanager data source
<a name="data-source-alertmanager-create"></a>

You can configure an Alertmanager data source to use with Grafana alerting.

**Prerequisites**

To configure Alertmanager, you must have the following pre-requisite complete:
+ A Prometheus instance, with ingested metrics, and at least one alert or recording rule configured. You will need the URL for your workspace.
+ Permissions defined for Amazon Managed Grafana to have read access to your alerts, alert groups, silences, and contact points from your Alertmanager implementation.

**To configure an Alertmanager data source**

1. From your Grafana console, in the Grafana menu, choose the **Data source** page under **Configuration**.

1. Choose **Add data source**, and select **Alertmanager** from the list of data source types.

1. Provide the following information for your new data source.
   + For **Name**, provide a name of your choosing for your data source.
   + For **Implementation**, choose your Alertmanager implementation – either **Prometheus**, **Mimir**, or **Cortex**.
   + Under **HTTP**, for **URL**, provide the Alertmanager URL. For Prometheus, this is the workspace URL, with `alertmanager` appended. For example, `https://myprometheus/workspaces/ws-example-1234-5678-abcd-xyz00000001/alertmanager`.
   + Under **Auth**, configure the authentication details needed to access your Alertmanager implementation.

1. Choose **Save & test** to finish your data source setup.

   If your data source is set up correctly, you will see a message saying **Health check passed**.