feat: add Istio monitoring dashboard

[qiridigital]

Istio Monitoring Dashboard

Adds a comprehensive Istio service mesh monitoring dashboard for SigNoz.

Dashboard Structure

Section	Panels	Key Metrics
General Overview	Total Requests, Request Rate, Avg Latency, Error Rate	istio_requests_total, istio_request_duration_milliseconds
Traffic Management	Request Distribution, Load Balancing, Circuit Breakers, Retries/Timeouts	istio_requests_total, envoy_cluster_upstream_rq_retry
Performance Metrics	Latency P50/P95/P99, Throughput, Response Times	istio_request_duration_milliseconds_bucket
Error Metrics	HTTP Errors, gRPC Errors, Failed Requests, TLS Failures	istio_requests_total, envoy_cluster_ssl_handshake
Resource Usage	CPU, Memory, TCP Connections	process_cpu_seconds_total, process_resident_memory_bytes
Control Plane	Pilot Pushes, Convergence Time, Connected Endpoints, Cert Issuance	pilot_xds_pushes, citadel_server_csr_count
Data Plane	Active Connections, Traffic Volume, Response Size, Connection Errors	envoy_cluster_upstream_cx_active, istio_request_bytes_sum
Security	mTLS Usage, Auth Policy, Cert Expirations, Policy Violations	istio_requests_total (connection_security_policy)

Variables

• namespace — Kubernetes namespace
• deployment_environment — Deployment environment
• service_name — Destination service name
• cluster — Kubernetes cluster (multi-cluster)

Files

• istio/istio-prometheus-v1.json — Dashboard JSON (169KB, 31 panels, 8 sections)
• istio/readme.md — Setup instructions with OTel Collector config

References

• Istio Standard Metrics
• Istio Observability
• Grafana Dashboard #7645

Closes SigNoz/signoz#6025