How do you monitor the relationships between microservices?

Several approaches are used to track connections between microservices:

• Service Mesh — solutions like Istio or Linkerd provide automatic management of connections, routing, monitoring, and security between services.

• Distributed Tracing — tools like Jaeger or Zipkin allow visualization of call chains between microservices, identifying bottlenecks and errors.

• Monitoring and Logging — centralized collection of logs (e.g., via ELK Stack) and metrics (Prometheus + Grafana) helps analyze interactions and service states.

• Documentation and Contract Testing — maintaining up-to-date API documentation (e.g., OpenAPI) and using contract tests ensure interaction correctness.

An example of using Jaeger tracing in Go:

import (
    "go.opentelemetry.io/otel"
    "go.opentelemetry.io/otel/trace"
)

func main() {
    tracer := otel.Tracer("my-service")
    ctx, span := tracer.Start(context.Background(), "operation")
    defer span.End()

    // Call to another microservice with context passing
}

By combining these tools, you can effectively monitor connections and the state of microservices.