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- Zero-configuration declarations: the Prometheus-on-Kubernetes convention pack (job/instance per the OTel-Prometheus compatibility spec, k8s SD labels, *_info descriptors, target_info enrichment) alongside the OTLP trace auto-stamp, plus Remote Write 2.0 inline metadata. - Calls endpoints follow the service entity declaration; self-calls compare full endpoint ids; no silent identity fallback. - Strict time-window contract: the source window is never narrower than the query's observed_at range; unsafe-to-extract predicates error instead of silently defaulting. - scope removed from the relationship schema (kept on entities as a display property); entity row contract restated per projected observation; endpoint encoding documented as the v1 storage-level key with its known collision limitation. - Sampling caveats corrected (ratios are representative only under unbiased sampling); snapshot relation synthesizes endpoint-only vertices; shared attributes provide join keys while co-declaration provides relationship semantics. Signed-off-by: Dennis Zhuang <killme2008@gmail.com>