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This article contains all the monitoring reference information for this service.
See Monitor Azure Functions for details on the data you can collect for Azure Functions and how to use it.
See Monitor executions in Azure Functions for details on using Application Insights to collect and analyze log data from individual functions in your function app.
Metrics
This section lists all the automatically collected platform metrics for this service. These metrics are also part of the global list of all platform metrics supported in Azure Monitor.
For information on metric retention, see Azure Monitor Metrics overview.
Hosting plans that allow your apps to scale dynamically support extra Functions-specific metrics:
These metrics are used to estimate the costs associated with on demand and always ready meters used for billing in a Flex Consumption plan:
| Metric | Description | Meter calculation |
|---|---|---|
| On Demand Function Execution Count | Total number of function executions in on demand instances. | OnDemandFunctionExecutionCount relates to the On Demand Total Executions meter. |
| Always Ready Function Execution Count | Total number of function executions in always ready instances. | AlwaysReadyFunctionExecutionCount relates to the Always Ready Total Executions meter. |
| On Demand Function Execution Units | Total MB-milliseconds from on demand instances while actively executing functions. | OnDemandFunctionExecutionUnits / 1,024,000 is the On Demand Execution Time meter, in GB-seconds. |
| Always Ready Function Execution Units | Total MB-milliseconds from always ready instances while actively executing functions. | AlwaysReadyFunctionExecutionUnits / 1,024,000 is the Always Ready Execution Time meter, in GB-seconds. |
| Always Ready Units | The total MB-milliseconds of always ready instances assigned to the app, whether or not functions are actively executing. | AlwaysReadyUnits / 1,024,000 is the Always Ready Baseline meter, in GB-seconds. |
In this table, all execution units are calculated by multiplying the fixed instance memory size, such as 512 MB or 2,048 MB, by total execution times, in milliseconds.
These metrics are used to monitor the performance and scaling behavior of your function app in a Flex Consumption plan:
| Metric | Description |
|---|---|
| Automatic Scaling Instance Count | The number of instances on which this app is running. Note that this is emitted every 30 seconds, and given Flex Consumption scales out and in fast, the number will be an aggregate of all new instances the app used in this time period. Make sure to change the aggregation to the minimum possible in the graph and the aggregation to "count". |
| Memory working set | The current amount of memory used by the app, in MB. Can be further filtered for each instance of the app. |
| Average memory working set | The average amount of memory used by the app, in megabytes (MB). Can be further filtered for each instance of the app. |
| CPU Percentage | The average percentage of CPU being used. Can be further filtered for each instance of the app. This is currently rolling out and might not be available for apps in all regions yet. |
These performance metrics help you understand resource utilization and scaling patterns in your Flex Consumption function app. The instance count metric is particularly useful for monitoring the dynamic scaling behavior, while memory and CPU metrics provide insights into resource consumption patterns.
Supported metrics for Microsoft.Web/sites
The following table lists the metrics available for the Microsoft.Web/sites resource type. Most of these metrics apply to both function app and web apps, which both run on App Service.
Note
These metrics aren't available when your function app runs on Linux in a Consumption plan.
- All columns might not be present in every table.
- Some columns might be beyond the viewing area of the page. Select Expand table to view all available columns.
Table headings
- Category - The metrics group or classification.
- Metric - The metric display name as it appears in the Azure portal.
- Name in REST API - The metric name as referred to in the REST API.
- Unit - Unit of measure.
- Aggregation - The default aggregation type. Valid values: Average (Avg), Minimum (Min), Maximum (Max), Total (Sum), Count.
- Dimensions - Dimensions available for the metric.
- Time Grains - Intervals at which the metric is sampled. For example,
PT1Mindicates that the metric is sampled every minute,PT30Mevery 30 minutes,PT1Hevery hour, and so on. - DS Export- Whether the metric is exportable to Azure Monitor Logs via diagnostic settings. For information on exporting metrics, see Create diagnostic settings in Azure Monitor.
| Metric | Name in REST API | Advanced platform metrics | Unit | Aggregation | Dimensions | Time Grains | DS Export |
|---|---|---|---|---|---|---|---|
| Always Ready Function Execution Count Always Ready Function Execution Count. For Flex Consumption FunctionApps only. |
AlwaysReadyFunctionExecutionCount |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Always Ready Function Execution Units Always Ready Function Execution Units. For Flex Consumption FunctionApps only. |
AlwaysReadyFunctionExecutionUnits |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Always Ready Units Always Ready Units. For Flex Consumption FunctionApps only. |
AlwaysReadyUnits |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Connections The number of bound sockets existing in the sandbox (w3wp.exe and its child processes). A bound socket is created by calling bind()/connect() APIs and remains until said socket is closed with CloseHandle()/closesocket(). For WebApps and FunctionApps. |
AppConnections |
No | Count | Average, Count, Maximum, Minimum | Instance |
PT1M | Yes |
| Average memory working set The average amount of memory used by the app, in megabytes (MiB). For WebApps and FunctionApps. |
AverageMemoryWorkingSet |
No | Bytes | Average | Instance |
PT1M | Yes |
| Average Response Time (deprecated) The average time taken for the app to serve requests, in seconds. For WebApps and FunctionApps. |
AverageResponseTime |
No | Seconds | Average | Instance |
PT1M | Yes |
| Data In The amount of incoming bandwidth consumed by the app, in MiB. For WebApps and FunctionApps. |
BytesReceived |
No | Bytes | Total (Sum) | Instance |
PT1M | Yes |
| Data Out The amount of outgoing bandwidth consumed by the app, in MiB. For WebApps and FunctionApps. |
BytesSent |
No | Bytes | Total (Sum) | Instance |
PT1M | Yes |
| Percentage CPU The average percentage of CPU being used. For Flex Consumption function apps only. |
CpuPercentage |
No | Percent | Average | Instance |
PT1M | Yes |
| CPU Time The amount of CPU consumed by the app, in seconds. For more information about this metric. Please see https://aka.ms/website-monitor-cpu-time-vs-cpu-percentage (CPU time vs CPU percentage). For WebApps only. |
CpuTime |
No | Seconds | Count, Total (Sum), Minimum, Maximum | Instance |
PT1M | Yes |
| Current Assemblies The current number of Assemblies loaded across all AppDomains in this application. For WebApps and FunctionApps. |
CurrentAssemblies |
No | Count | Average | Instance |
PT1M | Yes |
| File System Usage Percentage of filesystem quota consumed by the app. For WebApps and FunctionApps. |
FileSystemUsage |
No | Bytes | Average | <none> | PT6H, PT12H, P1D | Yes |
| Function Execution Count Function Execution Count. For FunctionApps only. |
FunctionExecutionCount |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Function Execution Units Function Execution Units. For FunctionApps only. |
FunctionExecutionUnits |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Gen 0 Garbage Collections The number of times the generation 0 objects are garbage collected since the start of the app process. Higher generation GCs include all lower generation GCs. For WebApps and FunctionApps. |
Gen0Collections |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Gen 1 Garbage Collections The number of times the generation 1 objects are garbage collected since the start of the app process. Higher generation GCs include all lower generation GCs. For WebApps and FunctionApps. |
Gen1Collections |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Gen 2 Garbage Collections The number of times the generation 2 objects are garbage collected since the start of the app process. For WebApps and FunctionApps. |
Gen2Collections |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Handle Count The total number of handles currently open by the app process. For WebApps and FunctionApps. |
Handles |
No | Count | Average | Instance |
PT1M | Yes |
| Health check status Health check status. For WebApps and FunctionApps. |
HealthCheckStatus |
No | Count | Average | Instance |
PT5M, PT1H, P1D | Yes |
| Http 101 The count of requests resulting in an HTTP status code 101. For WebApps and FunctionApps. |
Http101 |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 2xx The count of requests resulting in an HTTP status code >= 200 but < 300. For WebApps and FunctionApps. |
Http2xx |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 3xx The count of requests resulting in an HTTP status code >= 300 but < 400. For WebApps and FunctionApps. |
Http3xx |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 401 The count of requests resulting in HTTP 401 status code. For WebApps and FunctionApps. |
Http401 |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 403 The count of requests resulting in HTTP 403 status code. For WebApps and FunctionApps. |
Http403 |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 404 The count of requests resulting in HTTP 404 status code. For WebApps and FunctionApps. |
Http404 |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 406 The count of requests resulting in HTTP 406 status code. For WebApps and FunctionApps. |
Http406 |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http 4xx The count of requests resulting in an HTTP status code >= 400 but < 500. For WebApps and FunctionApps. |
Http4xx |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Http Server Errors The count of requests resulting in an HTTP status code >= 500 but < 600. For WebApps and FunctionApps. |
Http5xx |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Response Time The time taken for the app to serve requests, in seconds. For WebApps and FunctionApps. |
HttpResponseTime |
No | Seconds | Average | Instance |
PT1M | Yes |
| Automatic Scaling Instance Count The number of instances on which this app is running. |
InstanceCount |
No | Count | Average | <none> | PT1M | Yes |
| IO Other Bytes Per Second The rate at which the app process is issuing bytes to I/O operations that don't involve data, such as control operations. For WebApps and FunctionApps. |
IoOtherBytesPerSecond |
No | BytesPerSecond | Total (Sum) | Instance |
PT1M | Yes |
| IO Other Operations Per Second The rate at which the app process is issuing I/O operations that aren't read or write operations. For WebApps and FunctionApps. |
IoOtherOperationsPerSecond |
No | BytesPerSecond | Total (Sum) | Instance |
PT1M | Yes |
| IO Read Bytes Per Second The rate at which the app process is reading bytes from I/O operations. For WebApps and FunctionApps. |
IoReadBytesPerSecond |
No | BytesPerSecond | Total (Sum) | Instance |
PT1M | Yes |
| IO Read Operations Per Second The rate at which the app process is issuing read I/O operations. For WebApps and FunctionApps. |
IoReadOperationsPerSecond |
No | BytesPerSecond | Total (Sum) | Instance |
PT1M | Yes |
| IO Write Bytes Per Second The rate at which the app process is writing bytes to I/O operations. For WebApps and FunctionApps. |
IoWriteBytesPerSecond |
No | BytesPerSecond | Total (Sum) | Instance |
PT1M | Yes |
| IO Write Operations Per Second The rate at which the app process is issuing write I/O operations. For WebApps and FunctionApps. |
IoWriteOperationsPerSecond |
No | BytesPerSecond | Total (Sum) | Instance |
PT1M | Yes |
| Memory working set The current amount of memory used by the app, in MiB. For WebApps and FunctionApps. |
MemoryWorkingSet |
No | Bytes | Average | Instance |
PT1M | Yes |
| On Demand Function Execution Count On Demand Function Execution Count. For Flex Consumption FunctionApps only. |
OnDemandFunctionExecutionCount |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| On Demand Function Execution Units On Demand Function Execution Units. For Flex Consumption FunctionApps only. |
OnDemandFunctionExecutionUnits |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Private Bytes Private Bytes is the current size, in bytes, of memory that the app process has allocated that can't be shared with other processes. For WebApps and FunctionApps. |
PrivateBytes |
No | Bytes | Average | Instance |
PT1M | Yes |
| Requests The total number of requests regardless of their resulting HTTP status code. For WebApps and FunctionApps. |
Requests |
No | Count | Total (Sum) | Instance |
PT1M | Yes |
| Requests In Application Queue The number of requests in the application request queue. For WebApps and FunctionApps. |
RequestsInApplicationQueue |
No | Count | Average | Instance |
PT1M | Yes |
| Thread Count The number of threads currently active in the app process. For WebApps and FunctionApps. |
Threads |
No | Count | Average | Instance |
PT1M | Yes |
| Total App Domains The current number of AppDomains loaded in this application. For WebApps and FunctionApps. |
TotalAppDomains |
No | Count | Average | Instance |
PT1M | Yes |
| Total App Domains Unloaded The total number of AppDomains unloaded since the start of the application. For WebApps and FunctionApps. |
TotalAppDomainsUnloaded |
No | Count | Average | Instance |
PT1M | Yes |
| Workflow Action Completed Count Workflow Action Completed Count. For LogicApps only. |
WorkflowActionsCompleted |
No | Count | Total (Sum) | workflowName, status |
PT1M | Yes |
| Workflow Actions Failure Rate Workflow Actions Failure Rate. For LogicApps only. |
WorkflowActionsFailureRate |
No | Percent | Total (Sum) | workflowName |
PT1M | Yes |
| Logic App Job Pull Rate Per Second Logic Job Pull Rate per second. For LogicApps only. |
WorkflowAppJobPullRate |
No | CountPerSecond | Total (Sum) | accountName |
PT1M | Yes |
| Workflow Job Execution Delay Workflow Job Execution Delay. For LogicApps only. |
WorkflowJobExecutionDelay |
No | Seconds | Average | workflowName |
PT1M | Yes |
| Workflow Job Execution Duration Workflow Job Execution Duration. For LogicApps only. |
WorkflowJobExecutionDuration |
No | Seconds | Average | workflowName |
PT1M | Yes |
| Workflow Runs Completed Count Workflow Runs Completed Count. For LogicApps only. |
WorkflowRunsCompleted |
No | Count | Total (Sum) | workflowName, status |
PT1M | Yes |
| Workflow Runs dispatched Count Workflow Runs Dispatched Count. For LogicApps only. |
WorkflowRunsDispatched |
No | Count | Total (Sum) | workflowName |
PT1M | Yes |
| Workflow Runs Failure Rate Workflow Runs Failure Rate. For LogicApps only. |
WorkflowRunsFailureRate |
No | Percent | Total (Sum) | workflowName |
PT1M | Yes |
| Workflow Runs Started Count Workflow Runs Started Count. For LogicApps only. |
WorkflowRunsStarted |
No | Count | Total (Sum) | workflowName |
PT1M | Yes |
| Workflow Triggers Completed Count Workflow Triggers Completed Count. For LogicApps only. |
WorkflowTriggersCompleted |
No | Count | Total (Sum) | workflowName, status |
PT1M | Yes |
| Workflow Triggers Failure Rate Workflow Triggers Failure Rate. For LogicApps only. |
WorkflowTriggersFailureRate |
No | Percent | Total (Sum) | workflowName |
PT1M | Yes |
Metric dimensions
For information about what metric dimensions are, see Multi-dimensional metrics.
This service doesn't have any metrics that contain dimensions.
Resource logs
This section lists the types of resource logs you can collect for this service. The section pulls from the list of all resource logs category types supported in Azure Monitor.
Supported resource logs for Microsoft.Web/sites
| Category | Costs to export | Log table | Supports basic log plan | Supports ingestion-time transformation | Example queries |
|---|---|---|---|---|---|
| Report Antivirus Audit Logs | No | AppServiceAntivirusScanAuditLogs Report on any discovered virus or infected files that have been uploaded to their site. |
No | Yes | |
| App Service Application Logs | No | AppServiceAppLogs Logs generated through your application. |
No | Yes | Queries |
| Access Audit Logs | No | AppServiceAuditLogs Logs generated when publishing users successfully log on via one of the App Service publishing protocols. |
No | Yes | Queries |
| App Service Authentication logs (preview) | Yes | AppServiceAuthenticationLogs Logs generated through App Service Authentication for your application. |
No | Yes | Queries |
| App Service Console Logs | No | AppServiceConsoleLogs Console logs generated from application or container. |
No | Yes | Queries |
| Site Content Change Audit Logs | No | AppServiceFileAuditLogs Logs generated when app service content is modified. |
No | Yes | Queries |
| HTTP logs | No | AppServiceHTTPLogs Incoming HTTP requests on App Service. Use these logs to monitor application health, performance and usage patterns. |
No | Yes | Queries |
| IPSecurity Audit logs | No | AppServiceIPSecAuditLogs Logs generated through your application and pushed to Azure Monitoring. |
No | Yes | |
| App Service Platform logs | No | AppServicePlatformLogs Logs generated through AppService platform for your application. |
No | Yes | |
| Function Application Logs | No | FunctionAppLogs Log generated by Function Apps. It includes logs emitted by the Functions host and logs emitted by customer code. Use these logs to monitor application health, performance, and behavior. |
No | Yes | Queries |
| Workflow Runtime Logs | Yes | LogicAppWorkflowRuntime Logs generated during Logic Apps workflow runtime. |
No | Yes | Queries |
The log specific to Azure Functions is FunctionAppLogs.
For more information, see the App Service monitoring data reference.
Azure Monitor Logs tables
This section lists the Azure Monitor Logs tables relevant to this service, which are available for query by Log Analytics using Kusto queries. The tables contain resource log data and possibly more depending on what is collected and routed to them.
App Services
Microsoft.Web/sites
Activity log
The linked table lists the operations that can be recorded in the activity log for this service. These operations are a subset of all the possible resource provider operations in the activity log.
For more information on the schema of activity log entries, see Activity Log schema.
The following table lists operations related to Azure Functions that might be created in the activity log.
| Operation | Description |
|---|---|
| Microsoft.web/sites/functions/listkeys/action | Return the keys for the function. |
| Microsoft.Web/sites/host/listkeys/action | Return the host keys for the function app. |
| Microsoft.Web/sites/host/sync/action | Sync triggers operation. |
| Microsoft.Web/sites/start/action | Function app started. |
| Microsoft.Web/sites/stop/action | Function app stopped. |
| Microsoft.Web/sites/write | Change a function app setting, such as runtime version or enable remote debugging. |
You may also find logged operations that relate to the underlying App Service behaviors. For a more complete list, see Microsoft.Web resource provider operations.
Related content
- See Monitor Azure Functions for a description of monitoring Azure Functions.
- See Monitor Azure resources with Azure Monitor for details on monitoring Azure resources.