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* feat(factory): add service state tracking, AwaitHealthy, depends_on, and /healthz endpoint Add explicit lifecycle state tracking to factory.Registry services (starting/running/failed) modeled after Guava's ServiceManager. Services can declare dependencies via NewNamedService(..., dependsOn) which are validated for unknown refs and cycles at registry creation. AwaitHealthy blocks until all services reach running state. A /healthz endpoint is wired through signozapiserver returning 200/503 with per-service state. * feat(apiserver): move health endpoints to /api/v2/ and register readyz, livez * refactor(factory): use gonum for cycle detection, return error on cycles, fix test assertions Replace custom DFS cycle detection with gonum's topo.Sort + TarjanSCC. Dependency cycles now return an error from NewRegistry instead of being silently dropped. Use assert for final test assertions and require only for intermediate setup errors. * chore: go mod tidy * refactor(factory): decouple Handler from Registry, wire through Handlers struct Move Handler implementation to a private handler struct with NewHandler constructor instead of methods on *Registry. Route handler through the existing Handlers struct as RegistryHandler. Rename healthz.go to registry.go in signozapiserver. Fix handler_test.go for new param. * feat(factory): add ServiceWithHealthy interface, add Healthy to authz, user depends on authz Add ServiceWithHealthy interface embedding Service + Healthy. NamedService now delegates Healthy() to the underlying service, eliminating unwrapService. AuthZ interface requires Healthy(), implemented in both pkg and ee providers. User service declares dependency on authz via dependsOn. * test(integration): use /api/v2/healthz for readiness check, log 503 response body * fix(factory): replace fmt.Errorf with errors.Newf in tests to satisfy linter * feat: generate openapi spec * fix(integration): log errors at error level in healthz readiness check * test(integration): log and assert healthz response in test_setup * feat(user): implement ServiceWithHealthy for user service User service signals healthy after successful root user reconciliation or immediately when disabled. User Service interface now embeds factory.ServiceWithHealthy. * fix(factory): reflect service names as strings * fix(apiserver): document health 503 responses * feat: generate openapi spec