Distributed Tracing - Istio Service Mesh

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What is distributed tracing? 

Distributed tracing is a method for monitoring microservice applications. Using distributed tracing, we can follow the requests as they travel through the different pieces of the system being monitored. 

Envoy generates a unique request ID and tracing information and stores it as part of HTTP headers whenever a request enters the service mesh. Any application can then forward these headers to other services to create a full trace through the system. 

A distributed trace is a collection of spans. As requests flow through different system components, each component contributes a span. Each span has a name, start and finish timestamp, a set of key-value pairs called tags and logs, and a span context. 

Tags get applied to the whole span, and we can use them for querying and filtering.


Mesh Observability with Kiali 

Kiali is a management console for Istio-based service mesh. It provides dashboards, observability and lets us operate the mesh with robust configuration and validation capabilities. It shows the service mesh structure by inferring traffic topology and displays the health of the mesh. Kiali provides detailed metrics, robust validation, Grafana access, and strong integration for distributed tracing with Jaeger. 

To install Kiali, use the kiali.yaml file: 

$ kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.10/samples/addons/kiali.yaml

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