Load Balancer Details - Monitoring

This tab provides a graphical view of various data points being monitored for your load balancer. This tab opens as the default view when launched from the load balancers landing page.

1. Filter the data by the range of time you want to view by selecting it from the Show data for drop down list box.
   If the graphs do not refresh, click the ↻ (circular arrow) icon.
2. The graphs displayed by default are:
   • Sum request count. The total number of completed requests that were received and routed to the registered instances. Defaults to the sum statistic for the best output results.
   • Avg latency (MS). The average elapsed time (in milliseconds) between a request from the load balancer and when a response is received. Defaults to the average statistic for the best output results.
   • Unhealthy hosts. The number of unhealthy instances in each Availability Zone as it exceeds the unhealthy threshold defined for the health checks. If load balancing is enabled across zones, the number of unhealthy instances is based on the health criteria across all Availability Zones. Use the average statistic for the best output results.
   • Healthy hosts. The number of healthy instances in each Availability Zone as defined by the healthy threshold. If load balancing is enabled across zones, the number of healthy instances is based on the health criteria across all Availability Zones. Use the average statistic for the best output results.
   • Sum ELB 4xxs. When the listener is configured to use HTTP or HTTPS protocols, this metric represents the number of HTTP 4XX client error codes generated by the load balancer when a request is malformed or incomplete. Defaults to the sum statistic for the best output results.
   • Sum ELB 5xxs. When the listener is configured to use HTTP or HTTPS protocols, this metric represents the number of HTTP 5XX server error codes generated by the load balancer if there are no healthy instances registered, or if the request rate exceeds the capacity of the instances or the load balancer. Defaults to the sum statistic for the best output results.
   • Sum HTTP 2xxs. The number of HTTP response codes generated by registered instances but not by the load balancer. Defaults to the sum statistic for the best output results.
   • Sum HTTP 3xxs. The number of HTTP response codes generated by registered instances but not by the load balancer. Defaults to the sum statistic for the best output results.
   • Sum HTTP 4xxs. The number of HTTP response codes generated by registered instances but not by the load balancer. Defaults to the sum statistic for the best output results.
   • Sum HTTP 5xxs. The number of HTTP response codes generated by registered instances but not by the load balancer. Defaults to the sum statistic for the best output results.
3. The various ways to view the data in the graphs are:
   • Click on a graph to expand it.
   • Hover inside the graph to display a read-out of data-points desired.
   • Use the drop-down list boxes for Statistic, Show data for, and Measurement period to focus in on specific set of data points. For example, to view the combined number of healthy hosts within the last hour in 5-minute readings, select Sum from Statistic, Last hour from Show data for, and 5 minutes from Measurement period.