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Jaeger v1's web UI has no theme selector — it ships light-only. v2 (the OTel-Collector-based rewrite, image `jaegertracing/jaeger`, distinct from v1's `jaegertracing/ all-in-one`) ships a Light / Dark / Auto switcher in the UI nav. v2 is also the actively-developed line; v1 will be phased out within ~6-12 months. Migration is mechanical: - Image: `jaegertracing/all-in-one:1.76.0` → `jaegertracing/jaeger:2.17.0`. - Drop `COLLECTOR_OTLP_ENABLED: 'true'` env — v2 enables OTLP receivers by default. - UI port (16686) and OTLP ports (4317 / 4318) are unchanged, so the collector → jaeger:4317 forwarding pipeline keeps working without touching `otel-collector.yaml`. The compose comment is updated to reflect v2's distinct image name and UI capabilities.