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Copy file name to clipboardExpand all lines: articles/azure-monitor/alerts/proactive-diagnostics.md
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Smart detection detects and notifies about various issues, such as:
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*[Smart detection - Failure Anomalies](./proactive-failure-diagnostics.md). We use machine learning to set the expected rate of failed requests for your app, correlating with load, and other factors. Notifies if the failure rate goes outside the expected envelope.
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*[Smart detection - Performance Anomalies](./proactive-performance-diagnostics.md). Notifies if response time of an operation or dependency duration is slowing down, compared to historical baseline. It also notifies if we identify an anomalous pattern in response time, or page load time.
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*[Smart detection - Performance Anomalies](./smart-detection-performance.md). Notifies if response time of an operation or dependency duration is slowing down, compared to historical baseline. It also notifies if we identify an anomalous pattern in response time, or page load time.
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* General degradations and issues, like [Trace degradation](./proactive-trace-severity.md), [Memory leak](./proactive-potential-memory-leak.md), [Abnormal rise in Exception volume](./proactive-exception-volume.md) and [Security anti-patterns](./proactive-application-security-detection-pack.md).
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(The help links in each notification take you to the relevant articles.)
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*[metric alerts](./alerts-log.md) are set by you and can monitor a wide range of metrics such as CPU occupancy, request rates, page load times, and so on. You can use them to warn you, for example, if you need to add more resources. By contrast, Smart Detection of Failure Anomalies covers a small range of critical metrics (currently only failed request rate), designed to notify you in near real-time manner once your web app's failed request rate increases compared to web app's normal behavior. Unlike metric alerts, Smart Detection automatically sets and updates thresholds in response changes in the behavior. Smart Detection also starts the diagnostic work for you, saving you time in resolving issues.
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*[Smart Detection of performance anomalies](proactive-performance-diagnostics.md) also uses machine intelligence to discover unusual patterns in your metrics, and no configuration by you is required. But unlike Smart Detection of Failure Anomalies, the purpose of Smart Detection of performance anomalies is to find segments of your usage manifold that might be badly served - for example, by specific pages on a specific type of browser. The analysis is performed daily, and if any result is found, it's likely to be much less urgent than an alert. By contrast, the analysis for Failure Anomalies is performed continuously on incoming application data, and you will be notified within minutes if server failure rates are greater than expected.
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*[Smart Detection of performance anomalies](smart-detection-performance.md) also uses machine intelligence to discover unusual patterns in your metrics, and no configuration by you is required. But unlike Smart Detection of Failure Anomalies, the purpose of Smart Detection of performance anomalies is to find segments of your usage manifold that might be badly served - for example, by specific pages on a specific type of browser. The analysis is performed daily, and if any result is found, it's likely to be much less urgent than an alert. By contrast, the analysis for Failure Anomalies is performed continuously on incoming application data, and you will be notified within minutes if server failure rates are greater than expected.
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The notifications include diagnostic information. Here's an example:
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1.**Triage**. The notification shows you how many users or how many operations are affected. This information can help you assign a priority to the problem.
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2.**Scope**. Is the problem affecting all traffic, or just some pages? Is it restricted to particular browsers or locations? This information can be obtained from the notification.
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Smart detection notifications are enabled by default. They are sent to users that have [Monitoring Reader](../../role-based-access-control/built-in-roles.md#monitoring-reader) and [Monitoring Contributor](../../role-based-access-control/built-in-roles.md#monitoring-contributor) access to the subscription in which the Application Insights resource resides. To change the default notification, either click **Configure** in the email notification, or open **Smart detection settings** in Application Insights.
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