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Glossary

Alarm Metric Description

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Last updated: 2026-09-28 16:39:10

AI-Translated

Basic Description
You can configure alarm policies for the instance metrics that you are concerned about. When the running status of an Application Load Balancer (ALB) instance meets a certain condition, alarm information is promptly sent to the relevant user groups. This ensures that you can detect abnormal conditions in a timely manner and take appropriate measures to maintain system stability and reliability. For more information, see Alarm Overview.
ALB alarm policies cover the following metric dimensions:
Instance
Listener
Forwarding rule
Target group
AZ
Description of Alarm Policies in the Instance Dimension
Alarm Policy Type
Alarm Policy
Alarm Metric
Unit
Instance
Connection and bandwidth monitoring
Number of Active Connections
Count
﻿
﻿
Number of Inactive Connections
Count
﻿
﻿
Number of Concurrent Connections
Count
﻿
﻿
Number of New Connections
Count/m
﻿
﻿
Number of Discarded Connections
Count/m
﻿
﻿
Outbound Bandwidth
Mbps
﻿
﻿
Inbound Bandwidth
Mbps
﻿
﻿
Outbound Traffic
MiBytes
﻿
﻿
Inbound Traffic
MiBytes
﻿
Request and status code monitoring
Number of Requests per Second on ALB
Count/m
﻿
﻿
Number of Requests Discarded by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by ALB
Count/m
﻿
﻿
3xx Status Codes Returned by ALB
Count/m
﻿
﻿
4xx Status Codes Returned by ALB
Count/m
﻿
﻿
5xx Status Codes Returned by ALB
Count/m
﻿
﻿
500 Status Codes Returned by ALB
Count/m
﻿
﻿
502 Status Codes Returned by ALB
Count/m
﻿
﻿
503 Status Codes Returned by ALB
Count/m
﻿
﻿
504 Status Codes Returned by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
3xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
4xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
5xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
Number of Custom Responses
Count/m
﻿
﻿
Number of Redirects
Count/m
﻿
﻿
Number of Non-Sticky Requests
Count/m
﻿
Latency monitoring
Average Backend Response Time
ms
﻿
﻿
Average Request Latency
ms
﻿
Backend health monitoring
Number of Healthy Real Servers
Count
﻿
﻿
Number of Unhealthy Real Servers
Count
﻿
﻿
Number of TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend Connection Failures
Count/m
﻿
Status code proportion monitoring
Proportion of 2xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 3xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 4xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 5xx Status Codes Returned by Real Servers
%
Description of Alarm Policies in the Listener Dimension
Alarm Policy Type
Alarm policy
Alarm Metric
Unit
Listener
Connection and bandwidth monitoring
Number of Active Connections
Count
﻿
﻿
Number of Inactive Connections
Count
﻿
﻿
Number of Concurrent Connections
Count
﻿
﻿
Number of New Connections
Count/m
﻿
﻿
Number of Discarded Connections
Count/m
﻿
﻿
Outbound Bandwidth
Mbps
﻿
﻿
Inbound Bandwidth
Mbps
﻿
﻿
Outbound Traffic
MiBytes
﻿
﻿
Inbound Traffic
MiBytes
﻿
Request and status code monitoring
Number of Requests per Second on ALB
Count/s
﻿
﻿
Number of Requests Discarded by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by ALB
Count/m
﻿
﻿
3xx Status Codes Returned by ALB
Count/m
﻿
﻿
4xx Status Codes Returned by ALB
Count/m
﻿
﻿
5xx Status Codes Returned by ALB
Count/m
﻿
﻿
500 Status Codes Returned by ALB
Count/m
﻿
﻿
502 Status Codes Returned by ALB
Count/m
﻿
﻿
503 Status Codes Returned by ALB
Count/m
﻿
﻿
504 Status Codes Returned by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
3xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
4xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
5xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
Number of Custom Responses
Count/m
﻿
﻿
Number of Redirects
Count/m
﻿
﻿
Number of Non-Sticky Requests
Count/m
﻿
Latency monitoring
Average Backend Response Time
ms
﻿
﻿
Average Request Latency
ms
﻿
Backend health monitoring
Number of Healthy Real Servers
Count
﻿
﻿
Number of Unhealthy Real Servers
Count
﻿
﻿
Number of TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend Connection Failures
Count/m
﻿
Status code proportion monitoring
Proportion of 2xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 3xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 4xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 5xx Status Codes Returned by Real Servers
%
Description of Alarm Policies in the Forwarding Rule Dimension
Alarm Policy Type
Alarm Policy
Alarm Metric
Unit
Forwarding rule
Request and status code monitoring
Number of Requests per Second on ALB
Count/s
﻿
﻿
Number of Requests Discarded by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by ALB
Count/m
﻿
﻿
3xx Status Codes Returned by ALB
Count/m
﻿
﻿
4xx Status Codes Returned by ALB
Count/m
﻿
﻿
5xx Status Codes Returned by ALB
Count/m
﻿
﻿
500 Status Codes Returned by ALB
Count/m
﻿
﻿
502 Status Codes Returned by ALB
Count/m
﻿
﻿
503 Status Codes Returned by ALB
Count/m
﻿
﻿
504 Status Codes Returned by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
3xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
4xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
5xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
Number of Custom Responses
Count/m
﻿
﻿
Number of Redirects
Count/m
﻿
﻿
Number of Non-Sticky Requests
Count/m
﻿
Latency monitoring
Average Backend Response Time
ms
﻿
﻿
Average Request Latency
ms
﻿
Backend health monitoring
Number of Healthy Real Servers
Count
﻿
﻿
Number of Unhealthy Real Servers
Count
﻿
﻿
Number of Backend TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend Connection Failures
Count/m
﻿
Status code proportion monitoring
Proportion of 2xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
﻿
﻿
Proportion of 3xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
﻿
﻿
Proportion of 4xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
﻿
﻿
Proportion of 5xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
Description of Alarm Policies in the Target Group Dimension
Alarm Policy Type
Alarm Policy
Alarm Metric
Unit
Target group
Request and status code monitoring
Number of Requests per Second on ALB
Count/s
﻿
﻿
Number of Requests Discarded by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by ALB
Count/m
﻿
﻿
3xx Status Codes Returned by ALB
Count/m
﻿
﻿
4xx Status Codes Returned by ALB
Count/m
﻿
﻿
5xx Status Codes Returned by ALB
Count/m
﻿
﻿
500 Status Codes Returned by ALB
Count/m
﻿
﻿
502 Status Codes Returned by ALB
Count/m
﻿
﻿
503 Status Codes Returned by ALB
Count/m
﻿
﻿
504 Status Codes Returned by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
3xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
4xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
5xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
Number of Non-Sticky Requests
Count/m
﻿
Latency monitoring
Average Backend Response Time
ms
﻿
﻿
Average Request Latency
ms
﻿
Backend health monitoring
Number of Healthy Real Servers
Count
﻿
﻿
Number of Unhealthy Real Servers
Count
﻿
﻿
Number of Backend TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend Connection Failures
Count/m
﻿
Status code proportion monitoring
Proportion of 2xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
﻿
﻿
Proportion of 3xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
﻿
﻿
Proportion of 4xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
﻿
﻿
Proportion of 5xx Status Codes Returned by Real Servers for a Forwarding Rule
Count/m
Description of Alarm Policies in the AZ Dimension
Alarm Policy Type
Alarm Policy
Alarm Metric
Unit
AZ
Connection and bandwidth monitoring
Number of Active Connections
Count
﻿
﻿
Number of Inactive Connections
Count
﻿
﻿
Number of Concurrent Connections
Count
﻿
﻿
Number of New Connections
Count/m
﻿
﻿
Number of Discarded Connections
Count/m
﻿
﻿
Outbound Bandwidth
Mbps
﻿
﻿
Inbound Bandwidth
Mbps
﻿
﻿
Outbound Traffic
MiBytes
﻿
﻿
Inbound Traffic
MiBytes
﻿
Request and status code monitoring
Number of Requests per Second on ALB
Count/s
﻿
﻿
Number of Requests Discarded by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by ALB
Count/m
﻿
﻿
3xx Status Codes Returned by ALB
Count/m
﻿
﻿
4xx Status Codes Returned by ALB
Count/m
﻿
﻿
5xx Status Codes Returned by ALB
Count/m
﻿
﻿
500 Status Codes Returned by ALB
Count/m
﻿
﻿
502 Status Codes Returned by ALB
Count/m
﻿
﻿
503 Status Codes Returned by ALB
Count/m
﻿
﻿
504 Status Codes Returned by ALB
Count/m
﻿
﻿
2xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
3xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
4xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
5xx Status Codes Returned by Real Servers
Count/m
﻿
﻿
Number of Custom Responses
Count/m
﻿
﻿
Number of Redirects
Count/m
﻿
﻿
Number of Non-Sticky Requests
Count/m
﻿
Latency monitoring
Average Backend Response Time
ms
﻿
﻿
Average Request Latency
ms
﻿
Backend health monitoring
Number of TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend TLS Handshake Failures
Count/m
﻿
﻿
Number of Backend Connection Failures
Count/m
﻿
Status code proportion monitoring
Proportion of 2xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 3xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 4xx Status Codes Returned by Real Servers
%
﻿
﻿
Proportion of 5xx Status Codes Returned by Real Servers
%
﻿

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Alarm Policy Type	Alarm Policy	Alarm Metric	Unit
Instance	Connection and bandwidth monitoring	Number of Active Connections	Count
				Number of Inactive Connections	Count
				Number of Concurrent Connections	Count
				Number of New Connections	Count/m
				Number of Discarded Connections	Count/m
				Outbound Bandwidth	Mbps
				Inbound Bandwidth	Mbps
				Outbound Traffic	MiBytes
				Inbound Traffic	MiBytes
		Request and status code monitoring	Number of Requests per Second on ALB	Count/m
				Number of Requests Discarded by ALB	Count/m
				2xx Status Codes Returned by ALB	Count/m
				3xx Status Codes Returned by ALB	Count/m
				4xx Status Codes Returned by ALB	Count/m
				5xx Status Codes Returned by ALB	Count/m
				500 Status Codes Returned by ALB	Count/m
				502 Status Codes Returned by ALB	Count/m
				503 Status Codes Returned by ALB	Count/m
				504 Status Codes Returned by ALB	Count/m
				2xx Status Codes Returned by Real Servers	Count/m
				3xx Status Codes Returned by Real Servers	Count/m
				4xx Status Codes Returned by Real Servers	Count/m
				5xx Status Codes Returned by Real Servers	Count/m
				Number of Custom Responses	Count/m
				Number of Redirects	Count/m
				Number of Non-Sticky Requests	Count/m
		Latency monitoring	Average Backend Response Time	ms
		Latency monitoring		Average Request Latency	ms
		Backend health monitoring	Number of Healthy Real Servers	Count
				Number of Unhealthy Real Servers	Count
				Number of TLS Handshake Failures	Count/m
				Number of Backend TLS Handshake Failures	Count/m
				Number of Backend Connection Failures	Count/m
		Status code proportion monitoring	Proportion of 2xx Status Codes Returned by Real Servers	%
				Proportion of 3xx Status Codes Returned by Real Servers	%
				Proportion of 4xx Status Codes Returned by Real Servers	%
				Proportion of 5xx Status Codes Returned by Real Servers	%

tencent cloud

Application Load Balancer

Alarm Metric Description

Basic Description

Description of Alarm Policies in the Instance Dimension

Description of Alarm Policies in the Listener Dimension

Description of Alarm Policies in the Forwarding Rule Dimension

Description of Alarm Policies in the Target Group Dimension

Description of Alarm Policies in the AZ Dimension

Help and Support