Stack trace showed io.opentelemetry.exporter.internal.http.HttpExporter
sending to :4317 — Tempo on 4317 expects gRPC frames, gets HTTP, sends
RST. Switch endpoint to :4318 (Tempo OTLP HTTP receiver) and protocol to
http/protobuf so the SDK and Tempo speak the same protocol.
The gRPC config never took effect — Spring Boot SDK on micrometer-tracing-
otlp pulls in only the HTTP exporter by default; gRPC needs the explicit
opentelemetry-exporter-otlp jar.
Александр Зимин
b5b5bc512b