Add usage alerts documentation for AI assistant

guides/assistant.mdx

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 ## About the assistant
 
 The assistant answers questions about your documentation through natural language queries. It is embedded directly in your documentation site, providing users with immediate access to contextual help.
 
 The assistant uses agentic RAG (retrieval-augmented generation) with tool calling powered by Claude Sonnet 4. When users ask questions, the assistant:
 
 * **Searches and retrieves** relevant content from your documentation to provide accurate answers.
 * **Cites sources** and provides navigable links to take users directly to referenced pages.
 * **Generates copyable code examples** to help users implement solutions from your documentation.
 
 Each message sent to the assistant counts toward your plan's message allowance. If you exceed your allowance, additional messages incur overage charges. You can set spending limits or disable the assistant if you reach your message allowance.
 
 You can view assistant usage through your dashboard to understand user behavior and documentation effectiveness. Export and analyze query data to help identify:
 
@@ -28,15 +28,15 @@
 
 ## Configuring the assistant
 
 The assistant is enabled by default for Pro and Custom plans. You can manage the assistant from your [dashboard](https://dashboard.mintlify.com/products/assistant/settings), including enabling or disabling it, configuring response handling, and setting a spend limit.
 
 ### Assistant status
 
 Toggle the assistant status to enable or disable the assistant for your documentation site.
 
 ### Assistant deflection
 
 Enable the assistant to redirect unanswered questions to your support team. Provide an email address that the assistant will provide to users who ask questions that it cannot answer.
 
 ### Search sites
 
@@ -47,7 +47,7 @@
 Configure sites that the assistant can search for additional context when answering questions.
 
 - Sites must be publicly available.
 - Sites that require JavaScript to load are not supported.
 
 You can use the following filtering syntax when you configure external sites:
 
@@ -62,17 +62,28 @@
 
 ### Spend limit
 
 Set a spend limit to control what happens if you reach your message allowance. By default, the assistant will continue to answer user questions after you reach your message allowance, which incurs overages.
 
-In the **Billing** tab of the [Assistant Configurations](https://dashboard.mintlify.com/products/assistant/settings) page, you can set a spend limit for assistant messages beyond your allowance. When you reach your spend limit, the assistant is disabled until your message allowance resets.
+In the **Billing** tab of the [Assistant Configurations](https://dashboard.mintlify.com/products/assistant/settings/billing) page, you can set a spend limit for assistant messages beyond your allowance. When you reach your spend limit, the assistant is disabled until your message allowance resets.
 
-You can also set usage alerts to receive an email when you reach a certain percentage of your spend limit.
+### Usage alerts
+
+Configure usage alerts to receive email notifications when your spending approaches your limit. This helps you monitor costs and take action before reaching your spend limit.
+
+To set up usage alerts:
+
+1. Navigate to the **Billing** tab in your [Assistant Configurations](https://dashboard.mintlify.com/products/assistant/settings/billing).
+2. Toggle on **Usage Alerts**.
+3. Use the slider to set the percentage threshold (e.g., 80% of your spend limit).
+4. Save your changes.
+
+When your spending reaches the configured percentage, you'll receive an email alert. This gives you time to adjust your usage or increase your spend limit before the assistant is disabled.
 
 ## Using the assistant
 
 Users can access the assistant in three ways:
 
 - **Keyboard shortcut**: <kbd>Command</kbd> + <kbd>I</kbd> (<kbd>Ctrl</kbd> + <kbd>I</kbd> on Windows)
 - **Assistant button** next to the search bar
   <img
     src="/images/assistant/assistant-button-light.png"
@@ -92,9 +103,9 @@
     }}
     alt="Search bar and assistant button in dark mode."
   />
 - **URLs** with `?assistant=open` appended will open the assistant when the page loads. For example, [https://mintlify.com/docs?assistant=open](https://mintlify.com/docs?assistant=open).
 
 Both methods open a chat panel on the right side of your docs. Users can ask any question and the assistant will search your documentation for an answer. If no relevant information is found, the assistant will respond that it cannot answer the question.
 
 ## Making content AI ingestible
 
@@ -125,7 +136,7 @@
 - Discover user behavior patterns and common information needs from themes and patterns in queries.
 - Prioritize high-traffic pages for accuracy and quality improvements.
 
 You can explore queries from your [dashboard](https://dashboard.mintlify.com/products/assistant), but to get more powerful insights we recommend exporting a `CSV` file of your queries, responses, and sources to analyze with your preferred AI tool.
 
 1. Navigate to the [assistant page](https://dashboard.mintlify.com/products/assistant) in your dashboard.
 2. Select **Export to CSV**.