Add istio dashboard prometheus v1

[karanveersingh5623]

https://github.com/SigNoz/signoz/issues/6025

/claim https://github.com/SigNoz/signoz/issues/6025

PR: Istio Monitoring Dashboard with OpenTelemetry and SigNoz Integration

This PR introduces a monitoring dashboard for Istio in Kubernetes, leveraging OpenTelemetry Collector to ingest metrics into SigNoz for comprehensive insights.

Requirements

1. Kubernetes Cluster: Ensure it's installed (local or cloud).
2. Istio: Install on your local machine.
3. OpenTelemetry Collector: Deploy with otel-config.yaml for metric exports.

Key Configuration

• Prometheus Receiver: Collects metrics from istio-mesh and istiod.
• Processors: Adds environment tags to metrics.
• OTLP Exporter: Sends metrics to SigNoz with secure token access.

Deployment

1. Create namespace:

   
   kubectl create namespace istio-observability
   Apply permissions via otel-collector-serviceaccount.yaml, otel-collector-clusterrole.yaml, and otel-collector-clusterrolebinding.yaml.
   Install OpenTelemetry Collector:
   bash
   Copy code
   helm repo add open-telemetry https://open-telemetry.github.io/opentelemetry-helm-charts
   helm install --namespace istio-observability opentelemetry-collector open-telemetry/opentelemetry-collector -f otel-config.yaml
   Dashboard Overview
   General Overview: Total requests, request rate, latency, error rate.
   Traffic Management: Request distribution, load balancing, circuit breakers.
   Performance: Latency percentiles, throughput, response times.
   Errors: HTTP error rates (4xx, 5xx).
   Resource Usage: CPU and memory of Istio components.
   Control Plane: Pilot config syncs.
   Data Plane: Envoy metrics, inbound traffic.

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