Add Kong Gateway Dashboard

kong-gateway/README.md

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+# Kong Gateway Monitoring Dashboard - OTLP
+
+## Data Ingestion
+
+### Use prometheus receiver with OpenTelemetry Collector
+
+Add the following code to the collector metrics section of the OpenTelemetry Collector configuration file:
+
+```
+prometheus:
+  config:
+    scrape_configs:
+      - job_name: "kong-otel-collector"
+        scrape_interval: 30s
+        static_configs:
+          - targets: ["<KONG_GATEWAY_ADDRESS>:8001"]
+
+```
+
+## Dashboard panels
+
+## Variables
+
+- `{{service}}`: Service created in Kong Gateway
+- `{{route}}`: Route created in Kong Gateway
+- `{{code}}`: Service response code
+
+### Sections
+
+- General Overview
+![General Overview Section](assets/general.png)
+  - Total Requests
+- Request Metrics
+![Request Metrics Section](assets/request-metrics.png)
+   - Response Status Codes
+- Latency Metrics
+![Latency Metric Section](assets/latency-metrics.png)
+  - Request Latency
+  - Upstream Latency
+- Error Metrics
+![Error Metrics Section](assets/error-metrics.png)
+  - Total Errors
+- Traffic Metrics
+![Traffic Metrics Section 1](assets/traffic-metrics-1.png)
+![Traffic Metrics Section 2](assets/traffic-metrics-2.png)
+  - Incoming Traffic Volume
+  - Outgoing Traffic Volume
+  - Handled Connections
+  - Accepted Connections
+  - Active Connections
+- Resource Usage
+![Request Usage Section](assets/request-usage.png)
+  - Memory Usage - Kong
+