Health score. A health score provides real-time insight into the overall health and performance of your monitored entities. The health score is calculated based on anomalies detected for the entity, alerts triggered for the entity's metrics, and the status of the entity. The health score is displayed as a single numerical value that ranges from a Good (70-100) to Moderate (40-69) to Bad (0-39) distinction.

To view the health score for Azure Functions entities in the Metrics Explorer, filter the sw.metrics.healthscore metric by entity_types and select azurefunction.

Represents the number of active connections established by an application. This metric helps monitor app connectivity and resource usage.

Total App Domains. The average number of app domains loaded in the application.

Total App Domains Unloaded. The average number of application domains unloaded.

The number of garbage collection events for Generation 1 objects in an Azure Functions instance. This metric helps assess memory management efficiency.

The number of garbage collection events for Generation 2 objects in an Azure Functions instance. Higher generation garbage collections include all lower generation collections.

The number of garbage collection events for Generation 3 objects in an Azure Functions instance.

The number of assemblies currently loaded across all application domains in an Azure Functions instance. This metric helps track application dependencies and runtime behavior.

Function Execution Count. The total number of times a function app has executed. This value correlates to the number of times a function runs in an app.

Function Execution Units. The number of function execution units.

Tracks the number of open file handles in an Azure Functions environment. This metric helps monitor resource usage and potential file access issues.

Tracks HTTP 101 responses which indicate protocol switching (for example, upgrading from HTTP to WebSockets).

HTTP 2xx responses which indicate successful requests. These status codes confirm that the server successfully processed the request.

HTTP 3xx responses which indicate redirection. These status codes signal that the requested resource has moved to a different location.

HTTP 401 responses which indicate unauthorized access. This occurs when authentication credentials are missing or invalid.

HTTP 403 responses which indicate forbidden access. This happens when a request is denied due to insufficient permissions or security restrictions.

HTTP 404 responses which indicate that the requested resource was not found. This can occur when a URL is incorrect or the resource has been removed.

HTTP 406 responses which indicate that the requested format is not acceptable. This happens when the server cannot provide content in the format specified by the request.

HTTP 4xx responses which indicate client-side errors. These errors typically occur due to incorrect requests, authentication failures, or missing resources.

HTTP 5xx. The total number of requests with a status code greater than or equal to 500 but less than 600.

Bytes Received. The number of incoming data bytes.

Bytes Sent. The number of outgoing data bytes.

IO Other Bytes Per Second

IO Other Operations Per Second

IO Read Bytes Per Second. The number of bytes per second the app is reading from I/O operations.

IO Read Operations Per Second. The number of read I/O operations per second the app is issuing.

IO Write Bytes Per Second. The number of bytes per second the app is writing to I/O operations.

IO Write Operations Per Second. The number of write I/O operations per second the app is issuing.

Memory Working Set. The average amount of memory used by the app.

Average Memory Working Set. The average amount of memory used by the app.

Private Bytes. The average number of private bytes allocated to the app.

Requests In Application Queue. The average number of requests in the application queue.

Requests. The total number of requests.

Average Response Time. The average time taken for the app to serve requests.

The number of active threads in an Azure Functions instance.