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docs: add an OTel Collector setup best-practices guide - #663
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Substrate documents how to instrument a service but not how to stand up the collector it exports to, so pointing it at your own collector meant reading six manifests. Covers both topologies: GKE Managed OpenTelemetry as the default on GKE, with why its gateway Deployment suits Substrate's elastic actor workload, and a DaemonSet manifest for operators who need per-node isolation, full config control, or a non-GKE cluster. Also records the two constraints from agent-substrate#563: the compiled-in gRPC exporters require port 4317, not the 4318 GKE's docs advertise, and WithInsecure() makes https:// endpoints silently plaintext. Part of agent-substrate#563.
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Substrate documents how to instrument a service but not how to stand up the collector it exports to, so pointing it at your own collector meant reading six manifests.
Covers both topologies: GKE Managed OpenTelemetry as the default on GKE, with why its gateway Deployment suits Substrate's elastic actor workload, and a DaemonSet manifest for operators who need per-node isolation, full config control, or a non-GKE cluster.
Part of #563.