feat: Add Grafana and Perces monitoring dashboards for vLLM (#23498)

examples/online_serving/dashboards/perses/README.md

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+# Perses Dashboards for vLLM Monitoring
+
+This directory contains Perses dashboard configurations designed to monitor vLLM
+performance and metrics.
+
+## Requirements
+
+- Perses instance (standalone or via operator)
+- Prometheus data source configured in Perses
+- vLLM deployment with Prometheus metrics enabled
+
+## Dashboard Format
+
+We provide dashboards in the **native Perses YAML format** that works across all
+deployment methods:
+
+- **Files**: `*.yaml` (native Perses dashboard specifications)
+- **Format**: Pure dashboard specifications that work everywhere
+- **Usage**: Works with standalone Perses, API imports, CLI, and file provisioning
+- **Kubernetes**: Directly compatible with Perses Operator
+
+## Dashboard Descriptions
+
+- **[performance_statistics.yaml](./performance_statistics.yaml)**: Performance metrics with aggregated latency
+  statistics
+- **[query_statistics.yaml](./query_statistics.yaml)**: Query performance and deployment metrics
+
+## Deployment Options
+
+### Direct Import to Perses
+
+Import the dashboard specifications via Perses API or CLI:
+
+```bash
+percli apply -f performance_statistics.yaml
+```
+
+### Perses Operator (Kubernetes)
+
+The native YAML format works directly with the Perses Operator:
+
+```bash
+kubectl apply -f performance_statistics.yaml -n <namespace>
+```
+
+### File Provisioning
+
+Place the YAML files in a Perses provisioning folder for automatic loading.