This is a great question mirali_talpur and I believe the 'Sources Page' is the best option for you to start with. Any source of data (e.g. load balancer, server, application, etc.) is considered a source in Wavefront and can therefore be found in the 'Sources Page'. From the taskbar, click Browse > Sources. As you alluded to in your question, the load balancer will only be displayed on the Sources Page if it has reported data to Wavefront at least once.
Do you happen to know what the name of the Load Balancer is? If you can locate the name from the list on the 'Sources Page', then click on the 'Chart' icon to the left of the name. This will send you to the 'Metrics Browser' and will display a list of all metrics that have been reported by that load balancer in the last 4 weeks.
If you select a completed metric name from that list on the 'Metrics Browser', then it will direct you to a chart that will display data for that unique metric+source combination. Does this help to answer the question?
