Records the design reached in a /grill-with-docs session: how to track which
Service talks to which as more Services are added, using k8s-native options.
Decision: service identity = the workload's namespace (primary) plus a
`service-identity` label only in the few multi-Service namespaces; east-west
observability = Calico 3.30 Goldmane/Whisker (already in our Calico v3.30.7,
currently disabled) emitting to Loki for a durable trail; enforcement reuses the
existing Wave 1 egress track. Dedicated per-Service ServiceAccounts deferred and
a service mesh / mTLS / SPIFFE rejected — the trust model needs attribution-grade
forensics on a trusted, etcd-constrained cluster, not cryptographic
non-repudiation. This is the service-mesh evaluation the 2026-04-20 infra audit
flagged as missing; rejected alternatives (Retina, Hubble, Kiali, a custom Alloy
enricher) are recorded with rationale.
Adds glossary terms (Service identity, Goldmane / Whisker) to CONTEXT.md.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
