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Update the tracing configuration doc (#557) 

* Update the tracing configuration doc

* updating doc

Co-authored-by: Aman Bhardwaj <amanbha@users.noreply.github.com>
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Shalabh Mohan Shrivastava 2020-05-01 09:25:49 -07:00 committed by GitHub
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9
concepts/observability/traces.md
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@ -22,7 +22,7 @@ Dapr adds a HTTP/gRPC middleware to the Dapr sidecar. The middleware intercepts
## Correlation ID
For HTTP requests, Dapr injects a **X-Correlation-ID** header to requests. For gRPC calls, Dapr inserts a **X-Correlation-ID** as a field of a **header** metadata. When a request arrives without an correlation ID, Dapr creates a new one. Otherwise, it passes the correlation ID along the call chain.
Dapr uses the standard W3C Trace Context headers. For HTTP requests, Dapr uses `traceparent` header.For gRPC requests, Dapr uses `grpc-trace-bin` header.When a request arrives without a trace ID, Dapr creates a new one. Otherwise, it passes the trace ID along the call chain.
## Configuration
@ -35,11 +35,12 @@ metadata:
name: tracing
spec:
tracing:
enabled: true
expandParams: true
includeBody: true
samplingRate: "1"
```
`samplingRate` is used to enable or disable the tracing. To disable tracing,
set `samplingRate : "0"` in the configuration. The valid range of samplingRate is between 0 and 1 inclusive. The sampling rate determines whether a trace span should be sampled or not based. By default, the sampling rate is 1 in 10,000.
Please see the [References](#references) section for more details on how to configure tracing on local environment and Kubernetes environment.
Dapr supports pluggable exporters, defined by configuration files (in local mode) or a Kubernetes custom resource object (in Kubernetes mode). For example, the following manifest defines a Zipkin exporter: