You can use Cloud Monitor to view the monitoring data of a Server Load Balancer (SLB) instance, such as the number of connections, number of packets, and traffic.

Procedure

  1. Log on to the SLB console.
  2. On the Instances page, select the region in which the SLB instance that you want to view resides.
  3. Find the SLB instance and click the monitoring icon .
  4. Select the monitoring metrics that you want to view.
    The following table lists the monitoring metrics of SLB instances.
    Monitoring metric Description
    Traffic
    • Inbound Traffic: the amount of traffic consumed to access an SLB instance.
    • Outbound Traffic: the amount of traffic consumed by an SLB instance to access the Internet.
    Packets
    • Inbound Packets: the number of request packets received per second.
    • Outbound Packets: the number of response packets sent per second.
    Concurrent Connections
    • Active Connections Count: the number of TCP connections that are in the ESTABLISHED state. If persistent connections are used, a connection may transfer multiple file requests simultaneously.
    • Inactive Connections Count: the number of TCP connections that are not in the ESTABLISHED state. You can run the netstat -an command to view the connections for both Windows and Linux instances.
    • Maximum Concurrent Connections Count: the total number of TCP connections.
    New Connections The average number of new TCP connections established between clients and SLB instances in a statistical period.
    Dropped Traffic
    • Dropped Inbound Traffic: the amount of inbound traffic dropped per second.
    • Dropped Outbound Traffic: the amount of outbound traffic dropped per second.
    Dropped Packets
    • Dropped Inbound Packets: the number of inbound packets dropped per second.
    • Dropped Outbound Packets: the number of outbound packets dropped per second.
    Dropped Connections The number of connections dropped per second.
    Metrics specific to Layer 7 (HTTP or HTTPS) listeners
    Layer-7 QPS The number of HTTP or HTTPS requests that can be processed per second.
    Response Time (Listener) The average response time of an SLB instance.
    HTTP Status Code 2XX/3XX/4XX/5XX/Other HTTP Status Codes (Listener) The number of HTTP response codes returned by listeners.
    HTTP Status Code 4XX/5XX (Server) The number of HTTP response codes returned by backend servers.
    Response Time (Server) The average response time of backend servers.