Mention how to redirect the Jaeger traces to a specific Jaeger instan…

…ce (#16531)
matrix-org · Oct 23, 2023 · 3bcb6a0 · 3bcb6a0
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diff --git a/changelog.d/16531.doc b/changelog.d/16531.doc
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+Add a sentence to the opentracing docs on how you can have jaeger in a different place than synapse.
diff --git a/docs/opentracing.md b/docs/opentracing.md
@@ -51,6 +51,11 @@ docker run -d --name jaeger \
   jaegertracing/all-in-one:1
 ```
 
+By default, Synapse will publish traces to Jaeger on localhost.
+If Jaeger is hosted elsewhere, point Synapse to the correct host by setting
+`opentracing.jaeger_config.local_agent.reporting_host` [in the Synapse configuration](usage/configuration/config_documentation.md#opentracing-1)
+or by setting the `JAEGER_AGENT_HOST` environment variable to the desired address.
+
 Latest documentation is probably at
 https://www.jaegertracing.io/docs/latest/getting-started.
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		Add a sentence to the opentracing docs on how you can have jaeger in a different place than synapse.