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Server Load Balancer:CLB monitoring metrics

Last Updated:Jan 29, 2024

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

  • 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******"}].

    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.

Layer 4 monitoring metrics

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 per second on a port.

Count/s

instanceId, port, and vip

Average, Minimum, and Maximum

PacketRX

The number of inbound packets per second on a port.

Count/s

instanceId, port, and vip

Average, Minimum, and Maximum

TrafficRXNew

The amount of inbound data per second on a port.

bit/s

instanceId, port, and vip

Average, Minimum, and Maximum

TrafficTXNew

The amount of outbound data 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.

This metric includes all TCP and UDP connections that are in the ESTABLISHED state. A persistent connection can simultaneously transfer multiple file requests.

Count

instanceId, port, and vip

Average, Minimum, and Maximum

InactiveConnection

The number of inactive connections on a port.

This 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/s

instanceId, port, and vip

Average, Minimum, and Maximum

DropPacketRX

The number of inbound packets dropped per second on a listener.

Count/s

instanceId, port, and vip

Average, Minimum, and Maximum

DropPacketTX

The number of outbound packets dropped per second on a listener.

Count/s

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/s

instanceId

Average, Minimum, and Maximum

InstanceDropConnection

The number of connections dropped per second on an instance.

Count/s

instanceId

Average, Minimum, and Maximum

InstanceDropPacketRX

The number of inbound packets dropped per second on an instance.

Count/s

instanceId

Average, Minimum, and Maximum

InstanceDropPacketTX

The number of outbound packets dropped per second on an instance.

Count/s

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/s

instanceId

Average, Minimum, and Maximum

InstanceMaxConnection

The maximum number of concurrent connections per second on an instance.

Count/s

instanceId

Average, Minimum, and Maximum

InstanceNewConnection

The number of new connections per second on an instance.

Count/s

instanceId

Average, Minimum, and Maximum

InstancePacketRX

The number of packets received by a CLB instance per second.

Count/s

instanceId

Average, Minimum, and Maximum

InstancePacketTX

The number of packets sent by a CLB instance per second.

Count/s

instanceId

Average, Minimum, and Maximum

InstanceTrafficRX

The amount of traffic consumed to access a CLB instance from the Internet.

bit/s

instanceId

Average, Minimum, and Maximum

InstanceTrafficTX

The amount of 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

Layer 7 monitoring metrics

Metric

Description

Unit

Dimensions

Statistics

Qps

The number of queries per second (QPS) on a port, which indicates the number of HTTP and HTTPS requests processed per second.

Count/s

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/s

instanceId, port, and vip

Average

StatusCode3xx

The number of 3xx status codes returned by a CLB instance to clients through a port.

Count/s

instanceId, port, and vip

Average

StatusCode4xx

The number of 4xx status codes returned by a CLB instance to clients through a port.

Count/s

instanceId, port, and vip

Average

StatusCode5xx

The number of 5xx status codes returned by a CLB instance to clients through a port.

Count/s

instanceId, port, and vip

Average

StatusCodeOther

The number of other status codes returned by a CLB instance to clients through a port.

Count/s

instanceId, port, and vip

Average

UpstreamCode4xx

The number of 4xx status codes returned by backend servers to a CLB instance through a port.

Count/s

instanceId, port, and vip

Average

UpstreamCode5xx

The number of 5xx status codes returned by backend servers to clients through a port.

Count/s

instanceId, port, and vip

Average

UpstreamRt

The average latency of requests sent by backend servers to the proxy server 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/s

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/s

instanceId

Average

InstanceStatusCode3xx

The number of 3xx status codes returned by a CLB instance to clients.

Count/s

instanceId

Average

InstanceStatusCode4xx

The number of 4xx status codes returned by a CLB instance to clients.

Count/s

instanceId

Average

InstanceStatusCode5xx

The number of 5xx status codes returned by a CLB instance to clients.

Count/s

instanceId

Average

InstanceStatusCodeOther

The number of other status codes returned by a CLB instance to clients.

Count/s

instanceId

Average

InstanceUpstreamCode4xx

The number of 4xx status codes returned by backend servers to a CLB instance.

Count/s

instanceId

Average

InstanceUpstreamCode5xx

The number of 5xx status codes returned by backend servers to a CLB instance.

Count/s

instanceId

Average

InstanceUpstreamRt

The average latency of requests sent by backend servers to the proxy server.

ms

instanceId

Average

InstanceQpsUtilization

The QPS usage.

%

instanceId

Average, Maximum, and Minimum

References