ALB monitoring metrics

If requests to your Application Load Balancer (ALB) instance time out or trigger network issues such as throttling, you can check the monitoring metrics of the ALB instance to troubleshoot errors and check the load and performance of the ALB instance. This topic describes the monitoring metrics of ALB.

Background information

Before you call the CloudMonitor API, you must obtain the values of the Namespace, Period, MetricName, and Dimensions parameters of ALB.

Set the Namespace parameter to acs_alb.
Set the Period parameter to a multiple of 60. Default value: 60. Unit: seconds.
Set the Dimensions to a JSON string, such as [{"loadBalancerId":"alb-t93aj3yndojot5****"}]. Replace loadBalancerId in the Dimensions parameter with the ID of the ALB instance.

In the MetricName column of the following table, metrics without the DualStack_ prefix do not display the IPv4 values and IPv6 values of an ALB instance separately.
- If the ALB instance uses IPv4, metrics without the DualStack_ prefix display only IPv4 values.
- If the ALB instance uses dual stack, metrics without the DualStack_ prefix display the sum of IPv4 values and IPv6 values.
In the MetricName column of the following table, metrics with the DualStack_ prefix display IPv4 values and IPv6 values separately.
- If the ALB instance uses IPv4, the IPv6 value of a metric with the DualStack_ prefix is 0.0, and the IPv4 value of the metric is the actual value.
- If the ALB instance uses dual stack, a metric with the DualStack_ prefix displays both the IPv4 value and IPv6 value.

In the following table, a hyphen (-) indicates a metric without the DualStack_ prefix, which does not display the IPv4 value and IPv6 value separately.

Instance metrics

Metric	Unit	Metric name		Dimension	Statistics

Metric	Unit	Metric name		Dimension	Statistics
Number of active connections on an ALB instance	Count	LoadBalancerActiveConnection	DualStack_LoadBalancerActiveConnection	userId and loadBalancerId	Value
Number of inactive connections on an ALB instance	Count	LoadBalancerInactiveConnection	DualStack_LoadBalancerInactiveConnection	userId and loadBalancerId	Value
Maximum number of concurrent connections on an ALB instance	Count	LoadBalancerMaxConnection	DualStack_LoadBalancerMaxConnection	userId and loadBalancerId	Value
Number of backend TLS handshake failures per second	Count/s	LoadBalancerUpstreamTLSNegotiationError	DualStack_LoadBalancerUpstreamTLSNegotiationError	userId and loadBalancerId	Value
Number of new connections per second on an ALB instance	Count/s	LoadBalancerNewConnection	DualStack_LoadBalancerNewConnection	userId and loadBalancerId	Value
Number of connections dropped per second on an ALB instance	Count/s	LoadBalancerRejectedConnection	DualStack_LoadBalancerRejectedConnection	userId and loadBalancerId	Value
Number of backend connection failures per second on an ALB instance	Count/s	LoadBalancerUpstreamConnectionError	DualStack_LoadBalancerUpstreamConnectionError	userId and loadBalancerId	Value
Number of connections that fail TLS handshakes per second on an ALB instance	Count/s	LoadBalancerClientTLSNegotiationError	DualStack_LoadBalancerClientTLSNegotiationError	userId and loadBalancerId	Value
Number of custom responses per second on an ALB instance	Count/s	LoadBalancerHTTPFixedResponse	DualStack_LoadBalancerHTTPFixedResponse	userId and loadBalancerId	Value
Number of redirects per second on an ALB instance	Count/s	LoadBalancerHTTPRedirect	DualStack_LoadBalancerHTTPRedirect	userId and loadBalancerId	Value
Number of queries per second on an ALB instance	Count/s	LoadBalancerQPS	DualStack_LoadBalancerQPS	userId and loadBalancerId	Value
Number of nonsticky requests per second on an ALB instance	Count/s	LoadBalancerNonStickyRequest	DualStack_LoadBalancerNonStickyRequest	userId and loadBalancerId	Value
The backend response time on an ALB instance	ms	LoadBalancerUpstreamResponseTime	DualStack_LoadBalancerUpstreamResponseTime	userId and loadBalancerId	Value
The request latency on an ALB instance	ms	LoadBalancerRequestTime	DualStack_LoadBalancerRequestTime	userId and loadBalancerId	Value
The outbound bandwidth of an ALB instance	bit/s	LoadBalancerOutBits	DualStack_LoadBalancerOutBits	userId and loadBalancerId	Value
The inbound bandwidth of an ALB instance	bit/s	LoadBalancerInBits	DualStack_LoadBalancerInBits	userId and loadBalancerId	Value
Number of 2XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode2XX	DualStack_LoadBalancerHTTPCode2XX	userId and loadBalancerId	Value
Number of 3XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode3XX	DualStack_LoadBalancerHTTPCode3XX	userId and loadBalancerId	Value
Number of 4XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode4XX	DualStack_LoadBalancerHTTPCode4XX	userId and loadBalancerId	Value
Number of 500 status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode500	DualStack_LoadBalancerHTTPCode500	userId and loadBalancerId	Value
Number of 502 status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode502	DualStack_LoadBalancerHTTPCode502	userId and loadBalancerId	Value
Number of 503 status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode503	DualStack_LoadBalancerHTTPCode503	userId and loadBalancerId	Value
Number of 504 status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode504	DualStack_LoadBalancerHTTPCode504	userId and loadBalancerId	Value
Number of 5XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCode5XX	DualStack_LoadBalancerHTTPCode5XX	userId and loadBalancerId	Value
Number of backend 2XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCodeUpstream2XX	-	userId and loadBalancerId	Value
Number of backend 3XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCodeUpstream3XX	-	userId and loadBalancerId	Value
Number of backend 4XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCodeUpstream4XX	-	userId and loadBalancerId	Value
Number of backend 5XX status codes per second on an ALB instance	Count/s	LoadBalancerHTTPCodeUpstream5XX	-	userId and loadBalancerId	Value
Number of healthy backend servers of an ALB instance	Count	LoadBalancerHealthyHostCount	-	userId and loadBalancerId	Value
Number of unhealthy backend servers of an ALB instance	Count	LoadBalancerUnHealthyHostCount	-	userId and loadBalancerId	Value

Listener metrics

Metric	Unit	Metric name		Dimension	Statistics

Metric	Unit	Metric name		Dimension	Statistics
Number of active connections on a listener	Count	ListenerActiveConnection	DualStack_ListenerActiveConnection	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of inactive connections on a listener	Count	ListenerInactiveConnection	DualStack_ListenerInactiveConnection	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Maximum number of concurrent connections on a listener	Count	ListenerMaxConnection	DualStack_ListenerMaxConnection	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of connections that fail TLS handshakes per second on a listener	Count/s	ListenerClientTLSNegotiationError	DualStack_ListenerClientTLSNegotiationError	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of new connections per second on a listener	Count/s	ListenerNewConnection	DualStack_ListenerNewConnection	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of connections dropped per second on an listener	Count/s	ListenerRejectedConnection	DualStack_ListenerRejectedConnection	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of backend connection failures per second on a listener	Count/s	ListenerUpstreamConnectionError	DualStack_ListenerUpstreamConnectionError	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of backend TLS handshake failures per second on a listener	Count/s	ListenerUpstreamTLSNegotiationError	DualStack_ListenerUpstreamTLSNegotiationError	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of custom responses per second on a listener	Count/s	ListenerHTTPFixedResponse	DualStack_ListenerHTTPFixedResponse	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of redirects per second on a listener	Count/s	ListenerHTTPRedirect	DualStack_ListenerHTTPRedirect	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of queries per second on a listener	Count/s	ListenerQPS	DualStack_ListenerQPS	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of nonsticky requests per second on a listener	Count/s	ListenerNonStickyRequest	DualStack_ListenerNonStickyRequest	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
The backend response time on a listener	ms	ListenerUpstreamResponseTime	DualStack_ListenerUpstreamResponseTime	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
The request latency on a listener	ms	ListenerRequestTime	DualStack_ListenerRequestTime	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
The outbound bandwidth of a listener	bit/s	ListenerOutBits	DualStack_ListenerOutBits	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
The inbound bandwidth of a listener	bit/s	ListenerInBits	DualStack_ListenerInBits	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 2XX status codes per second on a listener	Count/s	ListenerHTTPCode2XX	DualStack_ListenerHTTPCode2XX	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 3XX status codes per second on a listener	Count/s	ListenerHTTPCode3XX	DualStack_ListenerHTTPCode3XX	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 4XX status codes per second on a listener	Count/s	ListenerHTTPCode4XX	DualStack_ListenerHTTPCode4XX	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 5XX status codes per second on a listener	Count/s	ListenerHTTPCode5XX	DualStack_ListenerHTTPCode5XX	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 500 status codes per second on a listener	Count/s	ListenerHTTPCode500	DualStack_ListenerHTTPCode500	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 502 status codes per second on a listener	Count/s	ListenerHTTPCode502	DualStack_ListenerHTTPCode502	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 503 status codes per second on a listener	Count/s	ListenerHTTPCode503	DualStack_ListenerHTTPCode503	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of 504 status codes per second on a listener	Count/s	ListenerHTTPCode504	DualStack_ListenerHTTPCode504	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of backend 2XX status codes per second on a listener	Count/s	ListenerHTTPCodeUpstream2XX	-	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of backend 3XX status codes per second on a listener	Count/s	ListenerHTTPCodeUpstream3XX	-	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of backend 4XX status codes per second on a listener	Count/s	ListenerHTTPCodeUpstream4XX	-	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of backend 5XX status codes per second on a listener	Count/s	ListenerHTTPCodeUpstream5XX	-	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of healthy backend servers associated with a listener	Count	ListenerHealthyHostCount	-	userId, loadBalancerId, listenerProtocol, and listenerPort	Value
Number of unhealthy backend servers associated with a listener	Count	ListenerUnHealthyHostCount	-	userId, loadBalancerId, listenerProtocol, and listenerPort	Value

Forwarding rule metrics

Metric	Unit	Metric name		Dimension	Statistics

Metric	Unit	Metric name		Dimension	Statistics
Number of backend connection failures per second for a forwarding rule	Count/s	RuleUpstreamConnectionError	DualStack_RuleUpstreamConnectionError	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of backend TLS handshake failures per second for a forwarding rule	Count/s	RuleUpstreamTLSNegotiationError	DualStack_RuleUpstreamTLSNegotiationError	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of nonsticky requests per second for a forwarding rule	Count/s	RuleNonStickyRequest	DualStack_RuleNonStickyRequest	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of queries per second for a forwarding rule	Count/s	RuleQPS	DualStack_RuleQPS	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The backend response time for a forwarding rule	ms	RuleUpstreamResponseTime	DualStack_RuleUpstreamResponseTime	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The request latency for a forwarding rule	ms	RuleRequestTime	DualStack_RuleRequestTime	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of backend 2XX status codes per second for a forwarding rule	Count/s	RuleHTTPCodeUpstream2XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of backend 3XX status codes per second for a forwarding rule	Count/s	RuleHTTPCodeUpstream3XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of backend 4XX status codes per second for a forwarding rule	Count/s	RuleHTTPCodeUpstream4XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of backend 5XX status codes per second for a forwarding rule	Count/s	RuleHTTPCodeUpstream5XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of healthy backend servers for a forwarding rule	Count	RuleHealthyHostCount	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
Number of unhealthy backend servers for a forwarding rule	Count	RuleUnHealthyHostCount	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 2XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream2XXRatio	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 3XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream3XXRatio	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 4XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream4XXRatio	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 5XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream5XXRatio	-	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value

Server group metrics

Metric	Unit	Metric name		Dimension	Statistics

Metric	Unit	Metric name		Dimension	Statistics
Number of backend connection failures per second for a server group	Count/s	ServerGroupUpstreamConnectionError	DualStack_ServerGroupUpstreamConnectionError	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of backend TLS handshake failures per second for a server group	Count/s	ServerGroupUpstreamTLSNegotiationError	DualStack_ServerGroupUpstreamTLSNegotiationError	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of nonsticky requests for a server group	Count/s	ServerGroupNonStickyRequest	DualStack_ServerGroupNonStickyRequest	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of queries per second for a server group	Count/s	ServerGroupQPS	DualStack_ServerGroupQPS	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
The backend response time of a server group	ms	ServerGroupUpstreamResponseTime	DualStack_ServerGroupUpstreamResponseTime	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
The request latency of a server group	ms	ServerGroupRequestTime	DualStack_ServerGroupRequestTime	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of backend 2XX status codes per second for a server group	Count/s	ServerGroupHTTPCodeUpstream2XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of backend 3XX status codes per second for a server group	Count/s	ServerGroupHTTPCodeUpstream3XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of backend 4XX status codes per second for a server group	Count/s	ServerGroupHTTPCodeUpstream4XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of backend 5XX status codes per second for a server group	Count/s	ServerGroupHTTPCodeUpstream5XX	-	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of healthy backend servers in a server group	Count	ServerGroupHealthyHostCount	-	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value
Number of unhealthy backend servers in a server group	Count	ServerGroupUnHealthyHostCount	-	userId, loadBalancerId, listenerProtocol, listenerPort, and serverGroupId	Value

Virtual IP address (VIP) metrics (Zone metrics)

By default, upgraded ALB instances support viewing the metrics on the VIP (Zone) tab. Before the upgrade, ALB instances in static IP mode supported this feature, while ALB instances in dynamic IP mode did not.

To create alert rules for the metrics on the VIP (Zone) tab, log on to the CloudMonitor console. For more information, see Configure alert rules for ALB metrics.

Metric	Unit	Metric name	Dimension	Statistics

Metric	Unit	Metric name	Dimension	Statistics
Number of active connections of a VIP	Count	VipActiveConnection	userId and loadBalancerId vip	Value
Number of inactive connections of a VIP	Count	VipInactiveConnection	userId, loadBalancerId, and vip	Value
Maximum number of concurrent connections of the VIP	Count	VipMaxConnection	userId, loadBalancerId, and vip	Value
Number of backend TLS handshake failures per second of a VIP	Count/s	VipUpstreamTLSNegotiationError	userId and loadBalancerId vip	Value
Number of new connections per second of a VIP	Count/s	VipNewConnection	userId and loadBalancerId vip	Value
Number of connections dropped by a VIP per second	Count/s	VipRejectedConnection	userId and loadBalancerId vip	Value
Number of backend connection failures per second of a VIP	Count/s	VipUpstreamConnectionError	userId and loadBalancerId vip	Value
Number of connections that fail TLS handshakes per second of a VIP	Count/s	VipClientTLSNegotiationError	userId and loadBalancerId vip	Value
Number of custom responses per second of a VIP	Count/s)	VipHTTPFixedResponse	userId and loadBalancerId vip	Value
Number of redirects per second of a VIP	Count/s	VipHTTPRedirect	userId and loadBalancerId vip	Value
Number of queries per second of a VIP	Count/s	VipQPS	userId and loadBalancerId vip	Value
Number of nonsticky requests per second of a VIP	Count/s	VipNonStickyRequest	userId and loadBalancerId vip	Value
The backend response time of a VIP	ms	VipUpstreamResponseTime	userId and loadBalancerId vip	Value
The request latency of a VIP	ms	VipRequestTime	userId and loadBalancerId vip	Value
The outbound bandwidth of a VIP	bit/s	VipOutBits	userId and loadBalancerId vip	Value
The inbound bandwidth of a VIP	bit/s	VipInBits	userId and loadBalancerId vip	Value
Number of 2XX status codes per second of a VIP	Count/s	VipHTTPCode2XX	userId and loadBalancerId vip	Value
Number of 3XX status codes per second of a VIP	Count/s	VipHTTPCode3XX	userId and loadBalancerId vip	Value
Number of 4XX status codes per second of a VIP	Count/s	VipHTTPCode4XX	userId and loadBalancerId vip	Value
Number of 5XX status codes per second of a VIP	Count/s	VipHTTPCode5XX	userId and loadBalancerId vip	Value
Number of 500 status codes per second of a VIP	Count/s	VipHTTPCode500	userId and loadBalancerId vip	Value
Number of 502 status codes per second of a VIP	Count/s	VipHTTPCode502	userId and loadBalancerId vip	Value
Number of 503 status codes per second of a VIP	Count/s	VipHTTPCode503	userId and loadBalancerId vip	Value
Number of 504 status codes per second of a VIP	Count/s	VipHTTPCode504	userId and loadBalancerId vip	Value

Metrics that can be viewed by using the API or SDK

The metrics in the following table are not displayed in the ALB console. You can query the metrics only by using the API or SDK. Each metric indicates the overall metric of an ALB instance. IPv4 and IPv6 values are not displayed separately.

Table 5. Forwarding rule metrics

Metric (console)	Unit	MetricName	Dimensions	Statistics
The percentage of backend 2XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream2XXRatio	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 3XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream3XXRatio	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 4XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream4XXRatio	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value
The percentage of backend 5XX status codes per second for a forwarding rule	%	RuleHTTPCodeUpstream5XXRatio	userId, loadBalancerId, listenerProtocol, listenerPort, and ruleId	Value

References

For more information about how to query and analyze monitoring data, see View the monitoring information about an ALB instance.

ALB monitoring metrics

Background information