c1610c93a1
After the observability-service-registry slices removed the observability env vars and the file-SD writer, several docs still instructed readers to set vars that no longer exist. Updated the live config instructions; historical decision-log entries are left intact. - README.md: removed VITE_GRAFANA_URL/VITE_PROMETHEUS_URL/ALERTMANAGER_URL from compose examples and the env-var block; added a note that observability is configured on the Services page; updated Notes. - frontend/README.md: dropped the stale VITE_* deep-link sentence. - docs/REQUIREMENTS.md: fixed one stale trailing phrase in the externalization decision-log entry (VITE_* no longer "remain"). - docs/monitoring-logging-design.md: added a "Superseded mechanisms" note under Implementation Plan so the Phase 2/3 file-SD + alertmanager_url details read as historical, not current wiring. - context.md: strengthened the status banner to cover the env->service- registry and file-SD->http_sd_configs shift; body marked historical. .env.example is assistant-edit-blocked; updated replacement text provided to the user separately.