DBX Storage Access docs

Author: elazarlachkar

docs/pics/cloud/integrations/databricks/storage-direct-access-keys.png

@@ -38,6 +38,91 @@ Then, select your authentication method:
   long-lived personal access tokens.
 </Info>
 
+### Storage Access
+
+Elementary requires access to the table history in order to enable automated monitors such as volume and freshness monitors.
+You can configure this in one of the following ways:
+
+#### Option 1: Fetch history using `DESCRIBE HISTORY`
+
+Elementary can fetch the table history by running `DESCRIBE HISTORY` queries on your Databricks warehouse.
+In the Elementary UI, choose **None** under **Storage access method**.
+
+This requires `SELECT` access on the relevant tables, as described in the permissions and security section above.
+
+#### Option 2: Credentials vending
+
+Elementary can access the storage using temporary credentials issued by Databricks through [credential vending](https://docs.databricks.com/aws/en/external-access/credential-vending).
+In the Elementary UI, choose **Credentials vending** under **Storage access method**.
+
+This requires granting `EXTERNAL USE SCHEMA` on the relevant schemas.
+
+When using this option, Elementary only reads the Delta transaction log files from storage.
+
+#### Option 3: Direct storage access
+
+Elementary can access the storage directly using credentials that you configure.
+In the Elementary UI, choose **Direct storage access** under **Storage access method**.
+
+When using this option, Elementary only reads the Delta transaction log files from storage.
+
+For S3-backed Databricks storage, you can configure access in one of the following ways:
+
+__AWS Role authentication__
+
+<img
+  src="/pics/cloud/integrations/databricks/storage-direct-access-role.png"
+  alt="Databricks direct storage access using AWS role ARN"
+/>
+
+This is the recommended approach, as it provides better security and follows AWS best practices.
+After choosing **Direct storage access**, select **AWS role ARN** under **Select S3 authentication method**.
+
+1. Create an IAM role that Elementary can assume.
+2. Select "Another AWS account" as the trusted entity.
+3. Enter Elementary's AWS account ID: `743289191656`.
+4. Optionally enable an external ID.
+5. Attach a policy that grants read access to the Delta log files.
+
+Use a policy similar to the following:
+
+```json
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Sid": "VisualEditor0",
+      "Effect": "Allow",
+      "Action": [
+        "s3:GetObject",
+        "s3:ListBucket"
+      ],
+      "Resource": [
+        "arn:aws:s3:::databricks-metastore-bucket",
+        "arn:aws:s3:::databricks-metastore-bucket/*_delta_log*"
+      ]
+    }
+  ]
+}
+```
+
+Provide the role ARN in the Elementary UI, and the external ID as well if you configured one.
+
+__AWS access keys__
+
+<img
+  src="/pics/cloud/integrations/databricks/storage-direct-access-keys.png"
+  alt="Databricks direct storage access using AWS access keys"
+/>
+
+If needed, you can instead provide direct AWS credentials.
+After choosing **Direct storage access**, select **Secret access key** under **Select S3 authentication method**.
+
+1. Create an IAM user that Elementary will use for storage access.
+2. Enable programmatic access.
+3. Attach the same read-only S3 policy shown above.
+4. Provide the AWS access key ID and secret access key in the Elementary UI.
+
 #### Access token (legacy)
 
 <img