P7.3: Add Grafana dashboard with 8 core panels and feature-gated rows (plan §10)
dashboards/miroir-overview.json — 50-panel dashboard covering:
- Core: cluster health, request rate, p50/p95/p99 latency, node comparison,
search overhead, task lag, shard distribution, rebalance activity
- Feature-gated collapsed rows: multi-search (§13.11), anti-entropy (§13.8),
settings broadcast (§13.5), CDC (§13.13), canary tests (§13.18),
search UI (§13.21)
Helm chart: dashboards.enabled creates a ConfigMap labeled
grafana_dashboard=1 for sidecar auto-import.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
c86f50fd76