Implement in-process multi-dataset sync isolation across core, network, persistence, and tests

docs/runbook.md

@@ -27,6 +27,15 @@ Capture these artifacts before remediation:
 - Current runtime configuration (excluding secrets).
 - Most recent deployment identifier and change window.
 
+## Multi-Dataset Gates
+
+Before enabling telemetry datasets in production:
+
+1. Enable `primary` only and record baseline primary sync lag.
+2. Enable `logs`; confirm primary lag remains within SLO.
+3. Enable `timeseries`; confirm primary lag remains within SLO.
+4. If primary SLO regresses, disable telemetry datasets first before broader rollback.
+
 ## Recovery Plays
 
 ### Peer unreachable or lagging