The real-time monitoring feature in Alibaba Cloud CDN collects data at an interval of 1 minute. You can query data transfer, bandwidth usage, and origin fetch statistics in the last 1 minute and earlier. You can query data in the last 7 days. The maximum time range per query is 24 hours. Real-time monitoring allows you to detect anomalies in network traffic and locate errors at the earliest opportunity.
Overview
Compared with resource monitoring, real-time monitoring supports a shorter maximum time range per query and a shorter maximum period of time within which historical data is available.
Time granularity
You can query monitoring data by using the Alibaba Cloud CDN console or API. However, the time granularity, the maximum time range that you can query, and the maximum period of time within which historical data is available are different. The following table describes the maximum time range to query, the time period within which historical data is available, and data delay.
Use the console
Time granularity
Maximum time range per query
Historical data available
Data delay
1 minute
1 hour
7 days
5 minutes
5 minutes
3 days
7 days
15 minutes
Use the API
Time granularity
Maximum time range per query
Historical data available
Data delay
1 minute
1 hour
7 days
5 minutes
5 minutes
3 days
93 days
15 minutes
1 hour
31 days
186 days
4 hours
Monitoring items and metrics
The following table describes the monitoring items. You can query metrics such as bandwidth and network traffic by specifying filter conditions, such as domain name, region, Internet service provider (ISP), and time range.
In terms of real-time monitoring, data is collected based on the region or ISP of client IP addresses. In terms of metering, fees are calculated based on the network traffic, bandwidth, and number of requests on Alibaba Cloud CDN points of presence (POPs) in each billable region. The resource monitoring data and the billing data may be slightly different due to different collection methods. The line chart of real-time monitoring displays the change of bandwidth usage. For more information about the metering data in bills, see Resource usage overview.
Data is collected and calculated by calling API operations. For more information, see the API references in the following table.
Monitoring item | Description | API operation |
Requests | Monitors the bandwidth, network traffic, number of requests, and QPS of accelerated domain names. | |
Back-to-origin Routing | Monitors the origin bandwidth and traffic of accelerated domain names. | |
Cache Hit Ratio/HTTP Status Code | Monitors the cache hit ratio, byte hit ratio, HTTP status codes 2xx, 3xx, 4xx, and 5xx for accelerated domain names. |
Usage notes
The traffic usage of accelerated domain names that is queried by using the monitoring or resource usage feature available in the Alibaba Cloud CDN or DCDN console or by calling API operations differs from that collected in logs. Typically, the traffic usage of accelerated domain names that is queried by using the monitoring or resource usage feature is 1.1 times that collected in logs. For more information, see Why is the traffic amount found by using the monitoring and usage analytics feature or the usage statistics feature different from the traffic amount that is logged?
Differences among resource usage query, resource monitoring, and real-time monitoring
Resource usage query: Usage data is collected by POP. You can query resource usage data based on the billable region where the POP belongs to, such as the Chinese mainland, Asia Pacific 1, and North America. For more information, see Query resource usage.
Resource monitoring and real-time monitoring: Monitoring data is collected based on client IP addresses. Each client IP address belongs to a region or an ISP. You can query monitoring data by region, ISP, or both. For more information, see Resource monitoring and Real-time monitoring.
Differences between resource monitoring and real-time monitoring
Minimum data delay: Real-time monitoring has a lower data delay. The data delay for real-time monitoring is about 5 minutes with the query granularity of 1 minute, while the data delay for resource monitoring is about 15 minutes with the query granularity of 5 minutes.
Minimum data granularity: Real-time monitoring supports smaller granularity. The minimum data query granularity for real-time monitoring is 1 minute, while the minimum data query granularity for resource monitoring is 5 minutes.
Query by protocol: Resource monitoring supports more protocols. Resource monitoring supports data query by HTTP, HTTPS, QUIC, IPv4, and IPv6, while real-time monitoring does not.
Procedure
- Log on to the Alibaba Cloud CDN console.
In the left-side navigation pane, choose .
On the Real-time Monitoring page, select the monitoring item that you want to query and filter conditions, and click Search.
The system displays the monitoring data based on the specified item and filter conditions for further analysis.
