Receive: Fixing auto-configuration of --receive.local-endpoint #2937
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Changes
Updated code that configures the local endpoint if --receive.local-endpoint is not specified.
Verification
Tested on a 3 node cluster in GKE using a StatefulSet deployment. In this case the node upon startup will use local hostname which includes the StatefulSet pod index, e.g: thanos-receive-us-west2-1. The GRPC port is appended and this lines up with the hash ring configuration. All nodes in hash-ring then begin to correctly participate in replication of time series.