This topic describes the metrics provided by Classic Load Balancer (CLB) for Layer 4 and Layer 7 protocols. You can create alert rules and set thresholds based on metrics to trigger alerts.
Usage notes
- You can call API operations to query monitoring data within the last 31 days.
- Set Project to acs_slb_dashboard, and set the data sampling period to 60 seconds. The Period parameter can be set only to a multiple of 60.
- Set the Dimensions parameter to a JSON string. Example:
[{"instanceId":"lb-bp1r92vzpemy099f******"}].In Dimensions, instanceId specifies the ID of the CLB instance, port specifies the port number of the CLB instance, and vip specifies the service address of the CLB instance.
Metrics for Layer 4 protocols
| Metric | Description | Unit | Dimensions | Statistics |
|---|---|---|---|---|
| HeathyServerCount | The number of healthy Elastic Compute Service (ECS) instances. | Count | instanceId | Average, Minimum, and Maximum |
| UnhealthyServerCount | The number of unhealthy ECS instances. | Count | instanceId | Average, Minimum, and Maximum |
| PacketTX | The number of outbound packets sent per second on a port. | Count/Second | instanceId, port, and vip | Average, Minimum, and Maximum |
| PacketRX | The number of inbound packets received per second on a port. | Count/Second | instanceId, port, and vip | Average, Minimum, and Maximum |
| TrafficRXNew | The amount of data received per second on a port. | bit/s | instanceId, port, and vip | Average, Minimum, and Maximum |
| TrafficTXNew | The amount of data sent per second on a port. | bit/s | instanceId, port, and vip | Average, Minimum, and Maximum |
| ActiveConnection | The number of active connections on a port, which is the number of connections that are currently in use. The metric includes all TCP and UDP connections that are in the ESTABLISHED state. If persistent connections are used, a connection can transfer multiple file requests simultaneously. | Count | instanceId, port, and vip | Average, Minimum, and Maximum |
| InactiveConnection | The number of inactive connections on a port. The metric includes all TCP and UDP connections that are not in the ESTABLISHED state. | Count | instanceId, port, and vip | Average, Minimum, and Maximum |
| NewConnection | The number of new TCP connections established between clients and a CLB instance within a statistical period. | Count | instanceId, port, and vip | Average, Minimum, and Maximum |
| MaxConnection | The number of all established TCP and UDP connections. | Count | instanceId, port, and vip | Average, Minimum, and Maximum |
| DropConnection | The number of connections dropped per second on a listener. | Count/Second | instanceId, port, and vip | Average, Minimum, and Maximum |
| DropPacketRX | The number of inbound packets dropped per second on a listener. | Count/Second | instanceId, port, and vip | Average, Minimum, and Maximum |
| DropPacketTX | The number of outbound packets dropped per second on a listener. | Count/Second | instanceId, port, and vip | Average, Minimum, and Maximum |
| DropTrafficRX | The amount of inbound traffic dropped per second. | bit/s | instanceId, port, and vip | Average, Minimum, and Maximum |
| DropTrafficTX | The amount of outbound traffic dropped per second. | bit/s | instanceId, port, and vip | Average, Minimum, and Maximum |
| InstanceActiveConnection | The number of active connections per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceDropConnection | The number of connections dropped per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceDropPacketRX | The number of inbound packets dropped per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceDropPacketTX | The number of outbound packets dropped per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceDropTrafficRX | The amount of inbound traffic dropped per second on an instance. | bit/s | instanceId | Average, Minimum, and Maximum |
| InstanceDropTrafficTX | The amount of outbound traffic dropped per second on an instance. | bit/s | instanceId | Average, Minimum, and Maximum |
| InstanceInactiveConnection | The number of inactive connections per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceMaxConnection | The maximum number of concurrent connections per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceNewConnection | The number of new connections per second on an instance. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstancePacketRX | The number of packets received by a CLB instance per second. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstancePacketTX | The number of packets sent by a CLB instance per second. | Count/Second | instanceId | Average, Minimum, and Maximum |
| InstanceTrafficRX | The traffic consumed to access a CLB instance from the Internet. | bit/s | instanceId | Average, Minimum, and Maximum |
| InstanceTrafficTX | The traffic consumed by a CLB instance to access the Internet. | bit/s | instanceId | Average, Minimum, and Maximum |
| InstanceMaxConnectionUtilization | The utilization of maximum connections. | % | instanceId | Average, Maximum, and Minimum |
| InstanceNewConnectionUtilization | The utilization of new connections. | % | instanceId | Average, Maximum, and Minimum |
Metrics for Layer 7 protocols
| Metric | Description | Unit | Dimensions | Statistics |
|---|---|---|---|---|
| Qps | The queries per second (QPS) on a port, which indicates the number of HTTP and HTTPS requests processed per second. | Count/Second | instanceId, port, and vip | Average |
| Rt | The average latency of requests on a port, which indicates the average response time of a CLB instance. | ms | instanceId, port, and vip | Average |
| StatusCode2xx | The number of 2xx status codes returned by a CLB instance to clients through a port. | Count/Second | instanceId, port, and vip | Average |
| StatusCode3xx | The number of 3xx status codes returned by a CLB instance to clients through a port. | Count/Second | instanceId, port, and vip | Average |
| StatusCode4xx | The number of 4xx status codes returned by a CLB instance to clients through a port. | Count/Second | instanceId, port, and vip | Average |
| StatusCode5xx | The number of 5xx status codes returned by a CLB instance to clients through a port. | Count/Second | instanceId, port, and vip | Average |
| StatusCodeOther | The number of other status codes returned by a CLB instance to clients through a port. | Count/Second | instanceId, port, and vip | Average |
| UpstreamCode4xx | The number of 4xx status codes returned by backend servers to a CLB instance through a port. | Count/Second | instanceId, port, and vip | Average |
| UpstreamCode5xx | The number of 5xx status codes returned by backend servers to clients through a port. | Count/Second | instanceId, port, and vip | Average |
| UpstreamRt | The average latency of requests sent by backend servers to the proxy through a port. | ms | instanceId, port, and vip | Average |
| InstanceQps | The QPS on an instance, which indicates the number of HTTP and HTTPS requests processed per second. | Count/Second | instanceId | Average |
| InstanceRt | The average response latency of an instance. | ms | instanceId | Average |
| InstanceStatusCode2xx | The number of 2xx status codes returned by a CLB instance to clients. | Count/Second | instanceId | Average |
| InstanceStatusCode3xx | The number of 3xx status codes returned by a CLB instance to clients. | Count/Second | instanceId | Average |
| InstanceStatusCode4xx | The number of 4xx status codes returned by a CLB instance to clients. | Count/Second | instanceId | Average |
| InstanceStatusCode5xx | The number of 5xx status codes returned by a CLB instance to clients. | Count/Second | instanceId | Average |
| InstanceStatusCodeOther | The number of other status codes returned by a CLB instance to clients. | Count/Second | instanceId | Average |
| InstanceUpstreamCode4xx | The number of 4xx status codes returned by backend servers to a CLB instance. | Count/Second | instanceId | Average |
| InstanceUpstreamCode5xx | The number of 5xx status codes returned by backend servers to a CLB instance. | Count/Second | instanceId | Average |
| InstanceUpstreamRt | The average latency of requests sent by backend servers to the proxy. | ms | instanceId | Average |
| InstanceQpsUtilization | The QPS usage. | % | instanceId | Average, Maximum, and Minimum |