feat(infra): Tempo + Prometheus + Grafana observability backplane in compose (refs #122)
Three built images on the cg network with config baked in: Tempo (OTLP ingest, ports 4317/4318), Prometheus, and Grafana with both datasources auto-provisioned. Config lives in infra/observability/. The verify-observability step runs early in CI verify-stack; the three containers are added to the failure log-dump list. Tempo's Grafana plugin has no datasource /health method, so the check proves Tempo reachability through Grafana's datasource proxy instead. refs #122
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# Tempo with our config baked in — so it reaches sibling containers on the CI
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# runner without the external-config-volume dance the upstream CG images need.
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FROM grafana/tempo:2.6.1
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COPY tempo.yaml /etc/tempo.yaml
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