[exporter/loadbalancing] Documents a workaround for load balancing on other attributes #37494
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… on an unsupported attribute
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Description
When using the load balancing exporter to produce span metrics, we wanted to load balance on an attribute other than
service.namebecause it doesn't spread our load that well. Figured it might be useful to document the workaround for othersLooks like #33660 is tracking the enhancement that'd make this workaround unnecessary
Testing
We use a similar set-up in production. Also used www.otelbin.io to validate the example configuration