If your Classic Load Balancer (CLB) instance encounters network issues, such as request timeouts and throttling, or you need to check the load and performance of your CLB instance, you can query the monitoring metrics of your CLB instance to perform analysis and troubleshooting. This topic describes the monitoring metrics of CLB.
Usage notes
To call the CloudMonitor API operations, you need to set the Namespace, Period, MetricName, and Dimensions parameters for your CLB instance as follows:
Set Namespace to
acs_slb_dashboard.Period defaults to 60 (in seconds) and you can also set it to a multiple of 60.
Set Dimensions to a JSON string. Example:
[{"instanceId":"lb-bp1r92vzpemy099f******"}]. Set the instanceId field in Dimensions to the ID of your CLB instance, the port field to the port of your CLB instance, and the vip field to the service address of your CLB instance.
CLB monitoring metrics
Metrics that can be viewed by using the console, API, or SDK
Layer 4 monitoring metrics
Category | Metric | Description | MetricName | Dimensions | Statistics |
Instance connection metrics | New instance connections | The number of new TCP and UDP connections per second on a CLB instance. Unit: Count/s | InstanceNewConnection | instanceId | Average, Minimum, and Maximum |
Dropped instance connections | The number of TCP and UDP connections dropped per second on a CLB instance. Unit: Count/s | InstanceDropConnection | instanceId | Average, Minimum, and Maximum | |
Active instance connections | The number of TCP connections in the ESTABLISHED state on a CLB instance. Unit: Count Note A persistent connection can simultaneously transfer multiple file requests. | InstanceActiveConnection | instanceId | Average, Minimum, and Maximum | |
Inactive instance connections | The number of TCP connections not in the ESTABLISHED state as well as UDP connections on a CLB instance. Unit: Count | InstanceInactiveConnection | instanceId | Average, Minimum, and Maximum | |
Concurrent instance connections | The number of TCP and UDP connections processed by a CLB instance. Unit: Count | InstanceMaxConnection | instanceId | Average, Minimum, and Maximum | |
Instance bandwidth or traffic metrics | Inbound instance traffic | The TCP and UDP traffic received by a CLB instance. Unit: bit/s | InstanceTrafficRX | instanceId | Average, Minimum, and Maximum |
Outbound instance traffic | The TCP and UDP traffic sent by a CLB instance per second. Unit: bit/s | InstanceTrafficTX | instanceId | Average, Minimum, and Maximum | |
Inbound instance packets | The number of TCP and UDP packets received by a CLB instance per second. Unit: Count/s | InstancePacketRX | instanceId | Average, Minimum, and Maximum | |
Outbound instance packets | The number of TCP and UDP packets sent by a CLB instance per second. Unit: Count/s | InstancePacketTX | instanceId | Average, Minimum, and Maximum | |
Dropped inbound instance traffic | The TCP and UDP traffic that a CLB instance fails to receive per second. Unit: bit/s | InstanceDropTrafficRX | instanceId | Average, Minimum, and Maximum | |
Dropped outbound instance traffic | The TCP and UDP traffic that a CLB instance fails to send per second. Unit: bit/s | InstanceDropTrafficTX | instanceId | Average, Minimum, and Maximum | |
Dropped inbound Instance packets | The number of TCP and UDP packets that a CLB instance fails to receive per second. Unit: Count/s | InstanceDropPacketRX | instanceId | Average, Minimum, and Maximum | |
Dropped outbound instance packets | The number of TCP and UDP packets that a CLB instance fails to send per second. Unit: Count/s | InstanceDropPacketTX | instanceId | Average, Minimum, and Maximum | |
Listener connection metrics | New listener connections | The number of new TCP or UDP connections per second on a listener port. Unit: Count/s | NewConnection | instanceId, port, and vip | Average, Minimum, and Maximum |
Dropped listener connections | The number of TCP or UDP connections dropped per second on a listener port. Unit: Count/s | DropConnection | instanceId, port, and vip | Average, Minimum, and Maximum | |
Active listener connections | The number of TCP connections in the ESTABLISHED state on a listener port. Unit: Count Note A persistent connection can simultaneously transfer multiple file requests. | ActiveConnection | instanceId, port, and vip | Average, Minimum, and Maximum | |
Inactive listener connections | The number of TCP connections not in the ESTABLISHED state or UDP connections on a listener port. Unit: Count | InactiveConnection | instanceId, port, and vip | Average, Minimum, and Maximum | |
Concurrent listener connections | The number of TCP or UDP connections processed by a listener port. Unit: Count | MaxConnection | instanceId, port, and vip | Average, Minimum, and Maximum | |
Listener bandwidth or traffic metrics | Inbound listener traffic | The TCP or UDP traffic received by a listener port per second. Unit: bit/s | TrafficRXNew | instanceId, port, and vip | Average, Minimum, and Maximum |
Outbound listener traffic | The TCP or UDP traffic sent by a listener port per second. Unit: bit/s | TrafficTXNew | instanceId, port, and vip | Average, Minimum, and Maximum | |
Inbound listener packets | The number of TCP or UDP packets received by a listener port per second. Unit: Count/s | PacketRX | instanceId, port, and vip | Average, Minimum, and Maximum | |
Outbound listener packets | The number of TCP or UDP packets sent by a listener port per second. Unit: Count/s | PacketTX | instanceId, port, and vip | Average, Minimum, and Maximum | |
Dropped inbound listener traffic | The TCP or UDP traffic that a listener port fails to receive per second. Unit: bit/s | DropTrafficRX | instanceId, port, and vip | Average, Minimum, and Maximum | |
Dropped outbound listener traffic | The TCP or UDP traffic that a listener port fails to send per second. Unit: bit/s | DropTrafficTX | instanceId, port, and vip | Average, Minimum, and Maximum | |
Dropped inbound listener packets | The number of TCP or UDP packets that a listener port fails to receive per second. Unit: Count/s | DropPacketRX | instanceId, port, and vip | Average, Minimum, and Maximum | |
Dropped outbound listener packets | The number of TCP or UDP packets that a listener port fails to send per second. Unit: Count/s | DropPacketTX | instanceId, port, and vip | Average, Minimum, and Maximum |
Layer 7 monitoring metrics
Category | Metric | Description | MetricName | Dimensions | Statistics |
Instance connection metric | Instance response time | The time taken for the client to send a request to the backend server and receive a response by using a CLB instance. Unit: ms | InstanceRt | instanceId | Average |
Instance request metric | Instance QPS | The number of HTTP or HTTPS requests that a CLB instance processes per second. Unit: Count/s | InstanceQps | instanceId | Average |
Instance status code metrics | Instance 2xx status codes | The number of 2xx Success status codes returned to the client from the backend server by using a CLB instance per second. Unit: Count/s | InstanceStatusCode2xx | instanceId | Average |
Instance 3xx status codes | The number of 3xx Redirection status codes returned to the client from the backend server by using a CLB instance per second. Unit: Count/s | InstanceStatusCode3xx | instanceId | Average | |
Instance 4xx status codes | The number of 4xx Client Error status codes returned to the client from the backend server by using a CLB instance per second. Unit: Count/s | InstanceStatusCode4xx | instanceId | Average | |
Instance 5xx status codes | The number of 5xx Server Error status codes returned to the client from the backend server by using a CLB instance per second. Unit: Count/s | InstanceStatusCode5xx | instanceId | Average | |
Other instance status codes | The number of status codes except 2xx, 3xx, 4xx, and 5xx returned to the client from the backend server by using a CLB instance per second. Unit: Count/s | InstanceStatusCodeOther | instanceId | Average | |
Backend instance status code metrics | Instance UpstreamCode4xx | The number of 4xx Client Error status codes returned to a CLB instance from the backend server per second. Unit: Count/s | InstanceUpstreamCode4xx | instanceId | Average |
Instance UpstreamCode5xx | The number of 5xx Server Error status codes returned to a CLB instance from the backend server per second. Unit: Count/s | InstanceUpstreamCode5xx | instanceId | Average | |
Listener connection metric | Listener response time | The time taken for the client to send a request to the backend server and receive a response by using a listener port. Unit: ms | Rt | instanceId, port, and vip | Average |
Listener request metric | Listener QPS | The number of HTTP or HTTPS requests that a listener port processes per second. Unit: Count/s | Qps | instanceId, port, and vip | Average |
Listener status code metrics | Listener 2xx status codes | The number of 2xx Success status codes returned to the client from the backend server by using a listener port per second. Unit: Count/s | StatusCode2xx | instanceId, port, and vip | Average |
Listener 3xx status codes | The number of 3xx Redirection status codes returned to the client from the backend server by using a listener port per second. Unit: Count/s | StatusCode3xx | instanceId, port, and vip | Average | |
Listener 4xx status codes | The number of 4xx Client Error status codes returned to the client from the backend server by using a listener port per second. Unit: Count/s | StatusCode4xx | instanceId, port, and vip | Average | |
Listener 5xx status codes | The number of 5xx Server Error status codes returned to the client from the backend server by using a listener port per second. Unit: Count/s | StatusCode5xx | instanceId, port, and vip | Average | |
Other listener status codes | The number of status codes except 2xx, 3xx, 4xx, and 5xx returned to the client from the backend server by using a listener port per second. Unit: Count/s | StatusCodeOther | instanceId, port, and vip | Average | |
Backend listener status code metrics | Listener UpstreamCode4xx | The number of 4xx Client Error status codes returned to the CLB instance from the backend server by using a listener port per second. Unit: Count/s | UpstreamCode4xx | instanceId, port, and vip | Average |
Listener UpstreamCode5xx | The number of 5xx Server Error status codes returned to the CLB instance from the backend server by using a listener port per second. Unit: Count/s | UpstreamCode5xx | instanceId, port, and vip | Average |
Metrics that can be viewed by using the API or SDK
Layer 4 monitoring metrics
Category | Metric | Description | MetricName | Dimensions | Statistics |
Listener health check metrics | Healthy Elastic Compute Service (ECS) instances | The number of healthy ECS instances that serve as backend servers for a listener port. Unit: Count | HeathyServerCount | instanceId, port, and vip | Average, Minimum, and Maximum |
Unhealthy ECS instances | The number of unhealthy ECS instances that serve as backend servers for a listener port. Unit: Count | UnhealthyServerCount | instanceId, port, and vip | Average, Minimum, and Maximum | |
Instance connection metrics | Instance connection utilization | The ratio of established connections to the maximum connections for a CLB instance. Unit: % | InstanceMaxConnectionUtilization | instanceId | Average, Maximum, and Minimum |
New instance connection utilization | The ratio of new connections to the maximum new connections for a CLB instance. Unit: % | InstanceNewConnectionUtilization | instanceId | Average, Maximum, and Minimum |
Layer 7 monitoring metrics
Category | Metric | Description | MetricName | Dimensions | Statistics |
Instance connection metric | Instance UpstreamRt | The time taken for a CLB instance to forward a request to the backend server and receive a response. Unit: ms | InstanceUpstreamRt | instanceId | Average |
Instance request metric | QPS utilization | The ratio of requests processed to the maximum requests that can be processed by a CLB instance. Unit: % | InstanceQpsUtilization | instanceId | Average, Maximum, and Minimum |
Listener connection metric | Listener UpstreamRt | The time taken for a listener port to forward a request to the backend server and receive a response. Unit: ms | UpstreamRt | instanceId, port, and vip | Average |
References
The monitoring data may be different from the billing data. For more information, see Monitoring data and billing data.
For more information about how to view CLB monitoring data, see View monitoring data of CLB.
For more information about how to configure alert rules for CLB instances, see Configure alert rules.