dendrite/docs/tracing/setup.md

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## OpenTracing Setup
![Trace when sending an event into a room](/docs/tracing/jaeger.png)
Dendrite uses [Jaeger](https://www.jaegertracing.io/) for tracing between microservices.
Tracing shows the nesting of logical spans which provides visibility on how the microservices interact.
This document explains how to set up Jaeger locally on a single machine.
### Set up the Jaeger backend
The [easiest way](https://www.jaegertracing.io/docs/1.18/getting-started/) is to use the all-in-one Docker image:
```
$ docker run -d --name jaeger \
-e COLLECTOR_ZIPKIN_HTTP_PORT=9411 \
-p 5775:5775/udp \
-p 6831:6831/udp \
-p 6832:6832/udp \
-p 5778:5778 \
-p 16686:16686 \
-p 14268:14268 \
-p 14250:14250 \
-p 9411:9411 \
jaegertracing/all-in-one:1.18
```
### Configuring Dendrite to talk to Jaeger
Modify your config to look like: (this will send every single span to Jaeger which will be slow on large instances, but for local testing it's fine)
```
tracing:
enabled: true
jaeger:
serviceName: "dendrite"
disabled: false
rpc_metrics: true
tags: []
sampler:
type: const
param: 1
```
then run the monolith server with `--api true` to use polylith components which do tracing spans:
```
$ ./dendrite-monolith-server --tls-cert server.crt --tls-key server.key --config dendrite.yaml --api true
```
### Checking traces
Visit http://localhost:16686 to see traces under `DendriteMonolith`.