Fleet overview page at /vendor/metrics showing per-tenant operational
metrics (agents, CPU, heap, HTTP requests, ingestion drops, uptime).
Queries each tenant's server via the new POST /api/v1/admin/server-metrics/query
REST API instead of direct ClickHouse access, supporting future per-tenant
CH instances.
Backend: TenantMetricsService fires 11 metric queries per tenant
concurrently over a 5-minute window, assembles into a summary snapshot.
ServerApiClient.queryServerMetrics() handles the M2M authenticated POST.
Frontend: VendorMetricsPage with KPI strip (fleet totals) and per-tenant
table with color-coded badges and heap usage bars. Auto-refreshes every 60s.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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