Docs: guide how to set up SAML with Okta (#24613)

* Docs: Okta SAML guide

* Apply suggestions from code review

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Docs: review fixes

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/enterprise/saml.md

@@ -204,6 +204,71 @@ org_mapping = Engineering:2, Sales:3
 allowed_organizations = Engineering, Sales
 ```
 
+## Set up SAML with Okta
+
+This guide will follow you through the steps of configuring SAML authentication in Grafana with [Okta](https://okta.com/). You need to be an admin in your Okta organization to access Admin Console and create SAML integration. You also need permissions to edit Grafana config file and restart Grafana server.
+
+### Configure the SAML integration in Okta
+
+To configure SAML integration with Okta, create integration inside the Okta organization first.
+
+1. Log in to the [Okta portal](https://login.okta.com/).
+1. Go to the Admin Console in your Okta organization by clicking **Admin** in the upper-right corner. If you are in the Developer Console, then click **Developer Console** in the upper-left corner and then click **Classic UI** to switch over to the Admin Console.
+1. In the Admin Console, navigate to **Applications** > **Applications**.
+1. Click **Add Application**.
+1. Click **Create New App** to start the Application Integration Wizard.
+1. Choose **Web** as a platform.
+1. Select **SAML 2.0** in the Sign on method section.
+1. Click **Create**.
+1. On the **General Settings** tab, enter a name for your Grafana integration. You can also upload a logo.
+1. On the **Configure SAML** tab, enter the SAML information related to your Grafana instance:
+    - In the **Single sign on URL** field, use the `/saml/acs` endpoint URL of your Grafana instance, for example, `https://grafana.example.com/saml/acs`.
+    - In the **Audience URI (SP Entity ID)** field, use the `/saml/metadata` endpoint URL, for example, `https://grafana.example.com/saml/metadata`.
+    - Leave the default values for **Name ID format** and **Application username**.
+    - In the **ATTRIBUTE STATEMENTS (OPTIONAL)** section, enter the SAML attributes to be shared with Grafana, for example:
+      
+      | Attribute name (in Grafana) | Value (in Okta profile)                |
+      | --------------------------- | -------------------------------------- |
+      | Login                       | `user.login`                           |
+      | Email                       | `user.email`                           |
+      | DisplayName                 | `user.firstName + " " + user.lastName` |
+    
+    - In the **GROUP ATTRIBUTE STATEMENTS (OPTIONAL)** section, enter a group attribute name (for example, `Group`) and set filter to `Matches regex .*` to return all user groups.
+1. Click **Next**.
+1. On the final Feedback tab, fill out the form and then click **Finish**.
+
+### Edit SAML options in the Grafana config file
+
+Once the application is created, configure Grafana to use it for SAML authentication. Refer to [Configuration]({{< relref "../installation/configuration.md" >}}) to get more information about how to configure Grafana.
+
+1. In the `[auth.saml]` section in the Grafana configuration file, set [`enabled`]({{< relref "./enterprise-configuration.md#enabled" >}}) to `true`.
+1. Configure the [certificate and private key]({{< relref "#certificate-and-private-key" >}}).
+1. On the Okta application page where you have been redirected after application created, navigate to the **Sign On** tab and find **Identity Provider metadata** link in the **Settings** section.
+1. Set the [`idp_metadata_url`]({{< relref "./enterprise-configuration.md#idp-metadata-url" >}}) to the URL obtained from the previous step. The URL should look like `https://<your-org-id>.okta.com/app/<application-id>/sso/saml/metadata`.
+1. Set the following options to the attribute names configured at the **step 10** of the SAML integration setup. You can find this attributes on the **General** tab of the application page (**ATTRIBUTE STATEMENTS** and **GROUP ATTRIBUTE STATEMENTS** in the **SAML Settings** section). 
+    - [`assertion_attribute_login`]({{< relref "./enterprise-configuration.md#assertion-attribute-login" >}})
+    - [`assertion_attribute_email`]({{< relref "./enterprise-configuration.md#assertion-attribute-email" >}})
+    - [`assertion_attribute_name`]({{< relref "./enterprise-configuration.md#assertion-attribute-name" >}})
+    - [`assertion_attribute_groups`]({{< relref "./enterprise-configuration.md#assertion-attribute-groups" >}})
+1. Save the configuration file and and then restart the Grafana server.
+
+When you are finished, the Grafana configuration might look like this example:
+
+```bash
+[server]
+root_url = https://grafana.example.com
+
+[auth.saml]
+enabled = true
+private_key_path = "/path/to/private_key.pem"
+certificate_path = "/path/to/certificate.cert"
+idp_metadata_url = "https://my-org.okta.com/app/my-application/sso/saml/metadata"
+assertion_attribute_name = DisplayName
+assertion_attribute_login = Login
+assertion_attribute_email = Email
+assertion_attribute_groups = Group
+```
+
 ## Troubleshoot SAML authentication
 
 To troubleshoot and get more log information, enable SAML debug logging in the configuration file. Refer to [Configuration]({{< relref "../installation/configuration.md#filters" >}}) for more information.