Target pools
Network load balancers distribute traffic across a set of compute instances known as a target pool. Target pools are regional resources which may contain compute instances across multiple zones within a single region. Each Google Cloud project may have up to 50 target pools. For NLBs, target pools may operate on individual compute instances or on a managed instance group. Because NLB target pools can distribute traffic across arbitrary instances, they're a good fit for sets of heterogeneous servers.
Target pools are where much of the actual traffic distribution occurs. When a request is received by a forwarding rule, Google Cloud will direct traffic to a member of the target pool based on session affinity. By default, session ...
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