Documentation forSolarWinds Observability

CDN metrics

An Azure CDN is a distributed network of servers that can efficiently deliver web content to users. CDNs store cached content on edge servers in point-of-presence (POP) locations that are close to end users, to minimize latency. Use the Azure Resource Manager to gather metrics for this resource, then ensure your cloud platform is configured in SolarWinds Observability to collect this resource type's data. See Add an Azure cloud account.

Depending on the subscription pricing tier of your Azure account or its resources, additional metrics may be available for this entity. To collect additional Azure metrics, select the premium pricing tier when configuring your Azure namespaces.

Many of the collected metrics from Azure CDN entities are displayed as widgets in SolarWinds Observability explorers; additional metrics may be collected and available in the Metrics Explorer. You can also create an alert for when an entity's metric value moves out of a specific range. See Entities in SolarWinds Observability for information about entity types in SolarWinds Observability.

The following table lists some of the metrics collected for these entities. To see the Azure CDN metrics in the Metrics Explorer, type azure.cdn in the search box.


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 CDN entities in the Metrics Explorer, filter the sw.metrics.healthscore metric by entity_types and select azurecdn.


ByteHitRatio. Of the total number of response bytes, the percentage that were served from the CDN cache.


OriginHealthPercentage. The percentage of successful health probes sent to backends.


OriginLatency. The average time from when the request was sent to the backend to when the last response byte was received.


OriginRequestCount. The total number of requests sent to origin.


Percentage4XX. The average percentage of requests with a status code greater than or equal to 400 but less than 500.


Percentage5XX. The average percentage of requests with a status code greater than or equal to 500 but less than 600.


RequestCount. The total number of client requests served by CDN.


RequestSize. The total number of bytes sent as requests from clients.


ResponseSize. The total number of bytes sent as responses from CDN edge to clients.


TotalLatency. The average time from the client request being received by CDN until the last response byte is sent from CDN to the client.


WebApplicationFirewallRequestCount. The total number of matched WAF requests.