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How to Setup an Alert for 80% Storage Usage on Azure SQL Managed Instance

Learn how to create an alert in Azure SQL Managed Instance for when storage usage exceeds `80%`. This guide will cover setup details and the necessary log queries. --- This video is based on the question https://stackoverflow.com/q/75359387/ asked by the user 'NP007' ( https://stackoverflow.com/u/10263771/ ) and on the answer https://stackoverflow.com/a/76779318/ provided by the user 'Paolo' ( https://stackoverflow.com/u/3390419/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to Setup Alert on Azure SQL MI instance for % storage space used? Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Setup an Alert for 80% Storage Usage on Azure SQL Managed Instance When managing databases in the cloud, monitoring space usage becomes critical. For Azure SQL Managed Instances (SQL MI), knowing when your storage usage hits a certain threshold can prevent potential issues and ensure smooth operations. In this guide, we're tackling the question of how to set up an alert when your Azure SQL MI instance reaches 80% of its allocated storage space. The Need for Monitoring Storage Usage High storage usage can lead to performance bottlenecks or, in the worst case, downtime if the instance runs out of space. An effective way to mitigate this risk is by setting up alerts that notify administrators when storage usage approaches its limits. The Challenge Unfortunately, the default alert metrics provided in Azure don’t allow you to directly set alerts based on percentages. This limitation can make monitoring storage usage somewhat challenging. However, there is a workaround to set up alerts based on percentage utilization by leveraging Azure's Diagnostic Settings and Log Analytics. Setting Up Alerts Using Log Analytics To create an alert for when the storage usage exceeds 80%, follow these steps: Step 1: Enable Diagnostic Settings First, ensure that your Azure SQL MI is configured to send metrics to a Log Analytics workspace. Here’s how you can do this: Go to your Azure SQL Managed Instance in the Azure portal. Navigate to the Diagnostic settings under the Monitoring section. Click on + Add diagnostic setting. Select the appropriate log categories that provide the essential metrics. Choose your Log Analytics workspace where these metrics will be stored. Save the settings. Step 2: Create a Log Search Alert Once the diagnostic settings are confirmed, you can set up a log search alert using the following Kusto Query Language (KQL) query: [[See Video to Reveal this Text or Code Snippet]] Explanation of the Query AzureMetrics: This pulls the metric data collected from the SQL MI. extend: This command allows you to create new columns that will hold additional information, such as reserved_storage and used_storage. summarize and bag_unpack: These functions are used to group the metrics by time, allowing for easy analysis. storage_used_percentage: This calculates the percentage of storage used. where: The condition that filters the results to show only when the storage used exceeds 80%. Step 3: Configure The Alert Once you have tested your query and confirmed the results are correct, you can set it up as an alert in Azure: Go to your Log Analytics workspace in the Azure portal. Select Alerts and then + New alert rule. Select the Condition as Custom log search and paste your KQL query. Set the threshold to trigger when the results are non-empty. Define action groups to notify you via email or any other means when an alert is triggered. Save the alert rule. Conclusion Setting up alerts for storage usage is an essential practice for maintaining the performance and reliability of your Azure SQL Managed Instances. By leveraging the diagnostic settings and using KQL for log search, you can effectively monitor and be alerted when your storage utilization exceeds critical limits. Remember, proactively managing your database resources can save you time, money, and headaches in the long run. Happy monitoring!