Azure Front Door monitoring data reference

This article contains all the monitoring reference information for this service.

See Monitor Azure Front Door for details on the data you can collect for Azure Front Door and how to use it.

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.

Important

Azure Front Door (classic) will be retired on March 31, 2027. To avoid any service disruption, it is important that you migrate your Azure Front Door (classic) profiles to Azure Front Door Standard or Premium tier by March 2027. For more information, see Azure Front Door (classic) retirement.

Supported metrics for Microsoft.Network/frontdoors

The following table lists the metrics available for the Microsoft.Network/frontdoors resource type.

• 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, PT1M indicates that the metric is sampled every minute, PT30M every 30 minutes, PT1H every 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.

Category: Backend Health

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Backend Health Percentage The percentage of successful health probes from the HTTP/S proxy to backends	BackendHealthPercentage	Percent	Average	Backend, BackendPool	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Category: Latency

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Backend Request Latency The time calculated from when the request was sent by the HTTP/S proxy to the backend until the HTTP/S proxy received the last response byte from the backend	BackendRequestLatency	MilliSeconds	Average	Backend	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Total Latency The time calculated from when the client request was received by the HTTP/S proxy until the client acknowledged the last response byte from the HTTP/S proxy	TotalLatency	MilliSeconds	Average	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Category: Traffic

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Backend Request Count The number of requests sent from the HTTP/S proxy to backends	BackendRequestCount	Count	Total (Sum)	HttpStatus, HttpStatusGroup, Backend	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Billable Response Size The number of billable bytes (minimum 2KB per request) sent as responses from HTTP/S proxy to clients.	BillableResponseSize	Bytes	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Request Count The number of client requests served by the HTTP/S proxy	RequestCount	Count	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Request Size The number of bytes sent as requests from clients to the HTTP/S proxy	RequestSize	Bytes	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Response Size The number of bytes sent as responses from HTTP/S proxy to clients	ResponseSize	Bytes	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Web Application Firewall Request Count The number of client requests processed by the Web Application Firewall	WebApplicationFirewallRequestCount	Count	Total (Sum)	PolicyName, RuleName, Action	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Supported metrics for Microsoft.Cdn/profiles

The following table lists the metrics available for the Microsoft.Cdn/profiles resource type.

• 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, PT1M indicates that the metric is sampled every minute, PT30M every 30 minutes, PT1H every 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.

Category: Latency

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Origin Latency The time calculated from when the request was sent by AFDX edge to the backend until AFDX received the last response byte from the backend.	OriginLatency	MilliSeconds	Average	Origin, Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Total Latency The time calculated from when the client request was received by the HTTP/S proxy until the client acknowledged the last response byte from the HTTP/S proxy	TotalLatency	MilliSeconds	Average	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry, Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Category: Origin Health

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Origin Health Percentage The percentage of successful health probes from AFDX to backends.	OriginHealthPercentage	Percent	Average	Origin, OriginGroup	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Category: Request Status

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Byte Hit Ratio This is the ratio of the total bytes served from the cache compared to the total response bytes	ByteHitRatio	Percent	Average	Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Percentage of 4XX The percentage of all the client requests for which the response status code is 4XX	Percentage4XX	Percent	Average	Endpoint, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Percentage of 5XX The percentage of all the client requests for which the response status code is 5XX	Percentage5XX	Percent	Average	Endpoint, ClientRegion, ClientCountry	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Category: Traffic

Metric	Name in REST API	Unit	Aggregation	Dimensions	Time Grains	DS Export
Origin Request Count The number of requests sent from AFDX to origin.	OriginRequestCount	Count	Total (Sum)	HttpStatus, HttpStatusGroup, Origin, Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Request Count The number of client requests served by the HTTP/S proxy	RequestCount	Count	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry, Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Request Size The number of bytes sent as requests from clients to AFDX.	RequestSize	Bytes	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry, Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Response Size The number of bytes sent as responses from HTTP/S proxy to clients	ResponseSize	Bytes	Total (Sum)	HttpStatus, HttpStatusGroup, ClientRegion, ClientCountry, Endpoint	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Web Application Firewall JS Challenge Request Count The number of JS challenge requests evaluated by the Web Application Firewall	WebApplicationFirewallJsRequestCount	Count	Total (Sum)	PolicyName, RuleName, Action	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes
Web Application Firewall Request Count The number of client requests processed by the Web Application Firewall	WebApplicationFirewallRequestCount	Count	Total (Sum)	PolicyName, RuleName, Action	PT1M, PT5M, PT15M, PT30M, PT1H, PT6H, PT12H, P1D	Yes

Note

The metrics are recorded and stored free of charge for a limited period of time. For an extra cost, you can store for a longer period of time.

The following table provides more detailed descriptions for the metrics.

Metrics	Description
Byte Hit Ratio	The percentage of traffic that was served from the Azure Front Door cache, computed against the total egress traffic. The byte hit ratio is low if most of the traffic is forwarded to the origin rather than served from the cache. Byte Hit Ratio = (egress from edge - egress from origin)/egress from edge. Scenarios excluded from bytes hit ratio calculations: You explicitly disable caching, either through the Rules Engine or query string caching behavior. You explicitly configure a Cache-Control directive with the no-store or private cache directives.
Origin Health Percentage	The percentage of successful health probes sent from Azure Front Door to origins.
Origin Latency	Azure Front Door calculates the time from sending the request to the origin to receiving the last response byte from the origin. WebSocket is excluded from the origin latency.
Origin Request Count	The number of requests sent from Azure Front Door to origins.
Percentage of 4XX	The percentage of all the client requests for which the response status code is 4XX.
Percentage of 5XX	The percentage of all the client requests for which the response status code is 5XX.
Request Count	The number of client requests served through Azure Front Door, including requests served entirely from the cache.
Request Size	The number of bytes sent in requests from clients to Azure Front Door.
Response Size	The number of bytes sent as responses from Front Door to clients.
Total Latency	Azure Front Door receives the client request and sends the last response byte to the client. This value is the total time taken. For WebSocket, this metric refers to the time it takes to establish the WebSocket connection.
Web Application Firewall Request Count	The number of requests processed by the Azure Front Door web application firewall.

Note

If a request to the origin times out, the value of the Http Status dimension is 0.

Metric dimensions

For information about what metric dimensions are, see Multi-dimensional metrics.

This service has the following dimensions associated with its metrics.

• Action
• Backend
• BackendPool
• ClientCountry
• ClientRegion
• HttpStatus
• HttpStatusGroup
• PolicyName
• RuleName

• Action
• ClientCountry
• ClientRegion
• Endpoint
• HttpStatus
• HttpStatusGroup
• Origin
• OriginGroup
• PolicyName
• RuleName

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.Network/frontdoors

Category	Category display name	Log table	Supports basic log plan	Supports ingestion-time transformation	Example queries	Costs to export
FrontdoorAccessLog	Frontdoor Access Log	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	No
FrontdoorWebApplicationFirewallLog	Frontdoor Web Application Firewall Log	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	No

Supported resource logs for Microsoft.Cdn/profiles

Category	Category display name	Log table	Supports basic log plan	Supports ingestion-time transformation	Example queries	Costs to export
AzureCdnAccessLog	Azure Cdn Access Log	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	No
FrontDoorAccessLog	FrontDoor Access Log	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	Yes
FrontDoorHealthProbeLog	FrontDoor Health Probe Log	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	Yes
FrontDoorWebApplicationFirewallLog	FrontDoor WebApplicationFirewall Log	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	Yes

Supported resource logs for Microsoft.Cdn/profiles/endpoints

Category	Category display name	Log table	Supports basic log plan	Supports ingestion-time transformation	Example queries	Costs to export
CoreAnalytics	Gets the metrics of the endpoint, e.g., bandwidth, egress, etc.	AzureDiagnostics Logs from multiple Azure resources.	No	No	Queries	No

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.

Azure Front Door Microsoft.Network/frontdoors

• AzureActivity
• AzureMetrics
• AzureDiagnostics

Azure Front Door Microsoft.Cdn/profiles

• AzureActivity
• AzureDiagnostics

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.

• Microsoft.Network resource provider operations

• Microsoft.Cdn resource provider operations

Related content

• See Monitor Azure Front Door for a description of monitoring Azure Front Door.
• See Monitor Azure resources with Azure Monitor for details on monitoring Azure resources.