AWS Elastic load balancer classic distributes the incoming application traffic across multiple EC2 instances in multiple Availability Zones. The Sumo Logic App for AWS Elastic Load Balancing Classic is a unified logs and metrics (ULM) App which helps you monitor the classic load balancer. The preconfigured dashboards provide information on the latency, HTTP backend codes, requests, and host status, that help you investigate the issues in the load balancer.
ELB logs are stored as .log files in the buckets you specify when you enable logging. The process to enable collection for these logs is described in AWS ELB Enable Access Logs.
The logs themselves contain these fields in this order:
datetime, ELB_Server, clientIP, port, backend, backend_port, requestProc, ba_Response, cli_Response, ELB_StatusCode, be_StatusCode, rcvd, send, method, protocol, domain, server_port, path
The log format is described in AWS ELB Access Log Collection.
For details on the metrics of AWS Elastic Load Balancing Classic, see here.