- Release Notes and Announcements
- CLB Release Notes
- [April 15, 2024] Domain Name Upgrade for Domain Name-based Public Network CLB
- [July 25, 2023] Adding Rate Limits on Shared CLB Instances
- [July 3, 2023] CLB API Authentication Upgrade
- [June 9, 2023] Adjusting the Grace Period for Pay-as-you-go CLB Instances
- [March 6, 2023] Launching Domain Name-Based Public CLBs
- [Feb. 24, 2023] Changing Health Check Source IP to 100.64.0.0/10 IP Range
- [July 8, 2022] Classic CLB Upgrade Prompt
- 【October 20, 2021】Classic CLB End-of-Sale Notice
- 【April 27, 2021】Announcement on the Authentication Upgrade for Certain CLB APIs
- Product Introduction
- Purchase Guide
- Getting Started
- Directions
- CLB Instance
- Directions for Upgrading to Domain Name-Based CLB
- Creating CLB Instances
- Creating an IPv6 CLB Instance
- Creating IPv6 NAT64 CLB Instances
- Creating an Anycast CLB Instance
- Configure CLB Forwarding Domain Name
- Configuring CLB Security Group
- Binding Private Network CLB to EIP
- Enabling or Disabling a CLB Instance
- Cloning CLB Instances
- Exporting CLB Instances
- Upgrade to a LCU-supported instances
- Adjusting Specification of LCU-supported CLBs
- Deleting CLB Instances
- Releasing Idle CLB Instances
- Configuring Deletion Protection
- Adjusting Instance Public Network Configurations
- CLB Listener
- CLB Listener Overview
- Configuring TCP Listener
- Configuring a UDP Listener
- Configuring TCP SSL Listener
- Configuring a QUIC Listener
- Configuring an HTTP Listener
- Configuring HTTPS Listener
- Load Balancing Methods
- Session Persistence
- Layer-7 Redirection Configuration
- Layer-7 Custom Configuration
- Layer-7 Domain Name Forwarding and URL Rules
- Using QUIC Protocol on CLB
- SNI Support for Binding Multiple Certificates to a CLB Instance
- Configuring gRPC Support for Layer-7 Protocols
- Real Server
- Health Check
- Certificate Management
- Log Management
- Monitoring and Alarm
- Cloud Access Management
- Classic CLB
- CLB Instance
- Best Practices
- Enabling Gzip Compression & Testing
- HTTPS Forwarding Configurations
- Obtaining Real Client IPs
- Best Practices for Configuring Load Balancing Monitoring Alerts
- Implementing HA Across Multiple AZs
- Load Balancing Algorithm Selection and Weight Configuration Examples
- Configuring WAF protection for CLB listening domain names
- Ops Guide
- Troubleshooting
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- Listener APIs
- Backend Service APIs
- Target Group APIs
- Redirection APIs
- Other APIs
- ModifyLoadBalancersProject
- InquiryPriceCreateLoadBalancer
- InquiryPriceModifyLoadBalancer
- InquiryPriceRenewLoadBalancer
- DescribeLoadBalancerTraffic
- DescribeTaskStatus
- DescribeClsLogSet
- CreateClsLogSet
- CreateTopic
- CreateLoadBalancerSnatIps
- DeleteLoadBalancerSnatIps
- SetLoadBalancerSecurityGroups
- SetSecurityGroupForLoadbalancers
- ReplaceCertForLoadBalancers
- DescribeLoadBalancerListByCertId
- SetLoadBalancerClsLog
- DescribeQuota
- DescribeResources
- Classic CLB APIs
- Load Balancing APIs
- Data Types
- Error Codes
- CLB API 2017
- FAQs
- Service Level Agreement
- Contact Us
- Glossary
- Release Notes and Announcements
- CLB Release Notes
- [April 15, 2024] Domain Name Upgrade for Domain Name-based Public Network CLB
- [July 25, 2023] Adding Rate Limits on Shared CLB Instances
- [July 3, 2023] CLB API Authentication Upgrade
- [June 9, 2023] Adjusting the Grace Period for Pay-as-you-go CLB Instances
- [March 6, 2023] Launching Domain Name-Based Public CLBs
- [Feb. 24, 2023] Changing Health Check Source IP to 100.64.0.0/10 IP Range
- [July 8, 2022] Classic CLB Upgrade Prompt
- 【October 20, 2021】Classic CLB End-of-Sale Notice
- 【April 27, 2021】Announcement on the Authentication Upgrade for Certain CLB APIs
- Product Introduction
- Purchase Guide
- Getting Started
- Directions
- CLB Instance
- Directions for Upgrading to Domain Name-Based CLB
- Creating CLB Instances
- Creating an IPv6 CLB Instance
- Creating IPv6 NAT64 CLB Instances
- Creating an Anycast CLB Instance
- Configure CLB Forwarding Domain Name
- Configuring CLB Security Group
- Binding Private Network CLB to EIP
- Enabling or Disabling a CLB Instance
- Cloning CLB Instances
- Exporting CLB Instances
- Upgrade to a LCU-supported instances
- Adjusting Specification of LCU-supported CLBs
- Deleting CLB Instances
- Releasing Idle CLB Instances
- Configuring Deletion Protection
- Adjusting Instance Public Network Configurations
- CLB Listener
- CLB Listener Overview
- Configuring TCP Listener
- Configuring a UDP Listener
- Configuring TCP SSL Listener
- Configuring a QUIC Listener
- Configuring an HTTP Listener
- Configuring HTTPS Listener
- Load Balancing Methods
- Session Persistence
- Layer-7 Redirection Configuration
- Layer-7 Custom Configuration
- Layer-7 Domain Name Forwarding and URL Rules
- Using QUIC Protocol on CLB
- SNI Support for Binding Multiple Certificates to a CLB Instance
- Configuring gRPC Support for Layer-7 Protocols
- Real Server
- Health Check
- Certificate Management
- Log Management
- Monitoring and Alarm
- Cloud Access Management
- Classic CLB
- CLB Instance
- Best Practices
- Enabling Gzip Compression & Testing
- HTTPS Forwarding Configurations
- Obtaining Real Client IPs
- Best Practices for Configuring Load Balancing Monitoring Alerts
- Implementing HA Across Multiple AZs
- Load Balancing Algorithm Selection and Weight Configuration Examples
- Configuring WAF protection for CLB listening domain names
- Ops Guide
- Troubleshooting
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- Listener APIs
- Backend Service APIs
- Target Group APIs
- Redirection APIs
- Other APIs
- ModifyLoadBalancersProject
- InquiryPriceCreateLoadBalancer
- InquiryPriceModifyLoadBalancer
- InquiryPriceRenewLoadBalancer
- DescribeLoadBalancerTraffic
- DescribeTaskStatus
- DescribeClsLogSet
- CreateClsLogSet
- CreateTopic
- CreateLoadBalancerSnatIps
- DeleteLoadBalancerSnatIps
- SetLoadBalancerSecurityGroups
- SetSecurityGroupForLoadbalancers
- ReplaceCertForLoadBalancers
- DescribeLoadBalancerListByCertId
- SetLoadBalancerClsLog
- DescribeQuota
- DescribeResources
- Classic CLB APIs
- Load Balancing APIs
- Data Types
- Error Codes
- CLB API 2017
- FAQs
- Service Level Agreement
- Contact Us
- Glossary
Alert Policies
Set up metric-based alert policies to notify target recipients when the monitored metric reaches the threshold.
You can create alert policies on the following levels:
Public network listener
Private network listener
Real server
Listener (Not available for private-network Classic CLBs)
Server port
Layer-7 protocol
Public/Private Network Listeners
Supported network listener metrics:
Metric | Unit | Description |
Inbound bandwidth | Mbps | Bandwidth consumed when data is coming into the CLB over the public network within a sampling period. |
Outbound bandwidth | Mbps | Bandwidth consumed by the CLB to access the public network within a sampling period. |
Inbound packets | Packets/s | Number of request data packets received by the CLB per second within a sampling period. |
Outbound packets | Packets/s | Number of data packets sent by the CLB per second within a sampling period. |
Real Server
CLB supports alert policies on the listener and server port level.
1. Listener level
Set up an policy to trigger alerts when the number of abnormal ports of real servers bound to the listener reaches the threshold. In the example below, the number of abnormal ports of all real servers under the selected listener is collected once every minute. If the number is greater than 10 per second for two consecutive sampling period, an alert is triggered. Only one alert is sent per day.
Note：
Configure the alert source:
Configure trigger conditions:
2. Server port level
You can configure a policy to receive alerts whenever a specified port of a real server bound to a listener is abnormal.
Configure the alert source:
Configure trigger conditions:
Note：
Real server port exception: The port of the real server is unavailable. Network jitter can also trigger port exceptions.
A listener-level policy is suggested as it covers ports of all bound real servers and is not affected by network jitter.
Layer-7 Protocol Monitoring
You can configure metri-based alert policies for layer-7 (HTTP/HTTPS) listeners. The specific metrics are as follows:
Metric | Unit | Description |
Inbound bandwidth | Mbps | Bandwidth used by the client to access CLB over the public network within a sampling period. |
Outbound bandwidth | Mbps | Bandwidth used by CLB to access the public network within a sampling period. |
Inbound packets | Packets/s | Number of request data packets received by CLB per second within a sampling period. |
Outbound packets | Packets/s | Number of data packets sent by CLB per second within a sampling period. |
New connections | - | Number of new connections established per minute within a sampling period. |
Active connections | - | Number of active connections per minute within a sampling period. |
Average response time | ms | Average response time of CLB within a sampling period. |
Longest response time | ms | Longest response time of CLB within a sampling period. |
Real server - 2xx status codes | – | Number of 2xx status codes returned by the real server within a sampling period. |
Real server - 3xx status codes | – | Number of 3xx status codes returned by the real server within a sampling period. |
Real server - 4xx status codes | – | Number of 4xx status codes returned by the real server within a sampling period. |
Real server - 5xx status codes | – | Number of 5xx status codes returned by the real server within a sampling period. |
Real server - 404 status codes | – | Number of 404 status codes returned by the real server within a sampling period. |
Real server - 502 status codes | – | Number of 502 status codes returned by the real server within a sampling period. |
CLB - 3xx status codes | - | Number of 3xx status codes returned by CLB within a sampling period. |
CLB - 4xx status codes | - | Number of 4xx status codes returned by CLB within a sampling period. |
CLB - 5xx status codes | - | Number of 5xx status codes returned by CLB within a sampling period. |
CLB - 404 status codes | - | Number of 404 status codes returned by CLB within a sampling period. |
CLB - 502 status codes | - | Number of 502 status codes returned by CLB within a sampling period. |
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