What are Azure Monitor Alerts?
Alerts help you detect and address issues before users notice them by proactively notifying you when Azure Monitor data indicates that there may be a problem with your infrastructure or application.
You can alert on any metric or log data source in the Azure Monitor data platform.
This diagram shows you how alerts work:
An alert rule monitors your telemetry and captures a signal that indicates that something is happening on a specified target. The alert rule captures the signal and checks to see if the signal meets the criteria of the condition. If the conditions are met, an alert is triggered, which initiates the associated action group and updates the state of the alert.
You create an alert rule by combining:
- The resource(s) to be monitored.
- The signal or telemetry from the resource
If you're monitoring more than one resource, the condition is evaluated separately for each of the resources and alerts are fired for each resource separately.
Once an alert is triggered, the alert is made up of:
- An alert processing rule allows you to apply processing on fired alerts. Alert processing rules modify the fired alerts as they are being fired. You can use alert processing rules to add or suppress action groups, apply filters or have the rule processed on a pre-defined schedule.
- An action group can trigger notifications or an automated workflow to let users know that an alert has been triggered. Action groups can include:
- Notification methods such as email, SMS, and push notifications.
- Automation Runbooks
- Azure functions
- ITSM incidents
- Logic Apps
- Secure webhooks
- Event hubs
- The alert condition is set by the system. When an alert fires, the alert’s monitor condition is set to ‘fired’, and when the underlying condition that caused the alert to fire clears, the monitor condition is set to ‘resolved’.
- The user response is set by the user and doesn’t change until the user changes it.
You can see all alert instances in all your Azure resources generated in the last 30 days on the Alerts page in the Azure portal.
Types of alerts
There are four types of alerts. This table provides a brief description of each alert type. See this article for detailed information about each alert type and how to choose which alert type best suits your needs.
|Metric alerts||Metric alerts evaluate resource metrics at regular intervals. Metrics can be platform metrics, custom metrics, logs from Azure Monitor converted to metrics or Application Insights metrics. Metric alerts have several additional features, such as the ability to apply multiple conditions and dynamic thresholds.|
|Log alerts||Log alerts allow users to use a Log Analytics query to evaluate resource logs at a predefined frequency.|
|Activity log alerts||Activity log alerts are triggered when a new activity log event occurs that matches the defined conditions.|
|Smart detection alerts||Smart detection on an Application Insights resource automatically warns you of potential performance problems and failure anomalies in your web application. You can migrate smart detection on your Application Insights resource to create alert rules for the different smart detection modules.|
Out-of-the-box alert rules (preview)
If you don't have alert rules defined for the selected resource, you can enable recommended out-of-the-box alert rules in the Azure portal.
The alert rule recommendations feature is currently in preview and is only enabled for VMs.
Azure role-based access control (Azure RBAC) for alerts
You can only access, create, or manage alerts for resources for which you have permissions. To create an alert rule, you need to have the following permissions:
- Read permission on the target resource of the alert rule
- Write permission on the resource group in which the alert rule is created (if you’re creating the alert rule from the Azure portal, the alert rule is created by default in the same resource group in which the target resource resides)
- Read permission on any action group associated to the alert rule (if applicable) These built-in Azure roles, supported at all Azure Resource Manager scopes, have permissions to and access alerts information and create alert rules:
- monitoring contributor
- monitoring reader
Alerts and State
You can configure whether log or metric alerts are stateful or stateless. Activity log alerts are stateless.
- Stateless alerts fire each time the condition is met, even if fired previously.
- Stateful alerts fire when the condition is met and then don't fire again or trigger any more actions until the conditions are resolved.
For stateful alerts, the alert is considered resolved when:
|Alert type||The alert is resolved when|
|Metric alerts||The alert condition isn't met for three consecutive checks.|
|Log alerts||The alert condition isn't met for 30 minutes for a specific evaluation period (to account for log ingestion delay), and
the alert condition isn't met for three consecutive checks.
When the alert is considered resolved, the alert rule sends out a resolved notification using webhooks or email and the monitor state in the Azure portal is set to resolved.
Manage your alerts programmatically
You can query you alerts instances to create custom views outside of the Azure portal, or to analyze your alerts to identify patterns and trends. We recommended that you use Azure Resource Graphs with the 'AlertsManagementResources' schema for managing alerts across multiple subscriptions. For an sample query, see Azure Resource Graph sample queries for Azure Monitor.
You can use Azure Resource Graphs:
You can also use the Alert Management REST API for lower scale querying or to update fired alerts.
See the Azure Monitor pricing page for information about pricing.
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