feat(monitoring): deploy Loki + Tempo + Promtail observability stack
- Loki (3.4.2): log aggregation on gitlab node, 7-day retention, TSDB storage
- Tempo (2.7.1): OTLP trace receiver on gitlab node, 7-day retention
- Promtail (3.4.2): DaemonSet log shipper with K8s pod discovery + RBAC
- Grafana datasources: Prometheus + Loki + Tempo with trace-to-log correlation
- Services: OTEL_EXPORTER_OTLP_ENDPOINT=http://tempo:4317 on ml-training,
trading, backtesting services
- CI deploy job: applies monitoring manifests alongside service deployments
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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