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# OpenTracing
-## Background
-
-OpenTracing is a semi-standard being adopted by a number of distributed
-tracing platforms. It is a common api for facilitating vendor-agnostic
-tracing instrumentation. That is, we can use the OpenTracing api and
-select one of a number of tracer implementations to do the heavy lifting
-in the background. Our current selected implementation is Jaeger.
-
-OpenTracing is a tool which gives an insight into the causal
-relationship of work done in and between servers. The servers each track
-events and report them to a centralised server - in Synapse's case:
-Jaeger. The basic unit used to represent events is the span. The span
-roughly represents a single piece of work that was done and the time at
-which it occurred. A span can have child spans, meaning that the work of
-the child had to be completed for the parent span to complete, or it can
-have follow-on spans which represent work that is undertaken as a result
-of the parent but is not depended on by the parent to in order to
-finish.
-
-Since this is undertaken in a distributed environment a request to
-another server, such as an RPC or a simple GET, can be considered a span
-(a unit or work) for the local server. This causal link is what
-OpenTracing aims to capture and visualise. In order to do this metadata
-about the local server's span, i.e the 'span context', needs to be
-included with the request to the remote.
-
-It is up to the remote server to decide what it does with the spans it
-creates. This is called the sampling policy and it can be configured
-through Jaeger's settings.
-
-For OpenTracing concepts see
-<https://opentracing.io/docs/overview/what-is-tracing/>.
-
-For more information about Jaeger's implementation see
-<https://www.jaegertracing.io/docs/>
-
-## Setting up OpenTracing
-
-To receive OpenTracing spans, start up a Jaeger server. This can be done
-using docker like so:
-
-```sh
-docker run -d --name jaeger \
- -p 6831:6831/udp \
- -p 6832:6832/udp \
- -p 5778:5778 \
- -p 16686:16686 \
- -p 14268:14268 \
- jaegertracing/all-in-one:1
-```
-
-Latest documentation is probably at
-https://www.jaegertracing.io/docs/latest/getting-started.
-
-## Enable OpenTracing in Synapse
-
-OpenTracing is not enabled by default. It must be enabled in the
-homeserver config by adding the `opentracing` option to your config file. You can find
-documentation about how to do this in the [config manual under the header 'Opentracing'](usage/configuration/config_documentation.md#opentracing).
-See below for an example Opentracing configuration:
-
-```yaml
-opentracing:
- enabled: true
- homeserver_whitelist:
- - "mytrustedhomeserver.org"
- - "*.myotherhomeservers.com"
-```
-
-## Homeserver whitelisting
-
-The homeserver whitelist is configured using regular expressions. A list
-of regular expressions can be given and their union will be compared
-when propagating any spans contexts to another homeserver.
-
-Though it's mostly safe to send and receive span contexts to and from
-untrusted users since span contexts are usually opaque ids it can lead
-to two problems, namely:
-
-- If the span context is marked as sampled by the sending homeserver
- the receiver will sample it. Therefore two homeservers with wildly
- different sampling policies could incur higher sampling counts than
- intended.
-- Sending servers can attach arbitrary data to spans, known as
- 'baggage'. For safety this has been disabled in Synapse but that
- doesn't prevent another server sending you baggage which will be
- logged to OpenTracing's logs.
-
-## Configuring Jaeger
-
-Sampling strategies can be set as in this document:
-<https://www.jaegertracing.io/docs/latest/sampling/>.
+Synapse now uses OpenTelemetry and the [documentation for tracing has moved](./tracing.md).
|