Sync docs from 2.1.x to gh-pages
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@@ -11,7 +11,7 @@ To that end, Sleuth:</p><div class="itemizedlist"><ul class="itemizedlist" style
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For example, HTTP propagation works over Zipkin-compatible request headers.</li><li class="listitem">Sleuth can propagate context (also known as baggage) between processes.
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Consequently, if you set a baggage element on a Span, it is sent downstream to other processes over either HTTP or messaging.</li><li class="listitem">Provides a way to create or continue spans and add tags and logs through annotations.</li><li class="listitem"><p class="simpara">If <code class="literal">spring-cloud-sleuth-zipkin</code> is on the classpath, the app generates and collects Zipkin-compatible traces.
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By default, it sends them over HTTP to a Zipkin server on localhost (port 9411).
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You can configure the location of the service by setting <code class="literal">spring.zipkin.baseUrl</code>.</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem">If you depend on <code class="literal">spring-rabbit</code>, your app sends traces to a RabbitMQ broker instead of HTTP.</li><li class="listitem">If you depend on <code class="literal">spring-kafka</code>, and set <code class="literal">spring.zipkin.sender.type: kafka</code>, your app sends traces to a Kafka broker instead of HTTP.</li></ul></div></li></ul></div><div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Caution"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="images/caution.png"></td><th align="left">Caution</th></tr><tr><td align="left" valign="top"><p><code class="literal">spring-cloud-sleuth-stream</code> is deprecated and should no longer be used.</p></td></tr></table></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Spring Cloud Sleuth is <a class="link" href="http://opentracing.io/" target="_top">OpenTracing</a> compatible.</li></ul></div><div class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>If you use Zipkin, configure the probability of spans exported by setting <code class="literal">spring.sleuth.sampler.probability</code>
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You can configure the location of the service by setting <code class="literal">spring.zipkin.baseUrl</code>.</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem">If you depend on <code class="literal">spring-rabbit</code>, your app sends traces to a RabbitMQ broker instead of HTTP.</li><li class="listitem">If you depend on <code class="literal">spring-kafka</code>, and set <code class="literal">spring.zipkin.sender.type: kafka</code>, your app sends traces to a Kafka broker instead of HTTP.</li></ul></div></li></ul></div><div class="caution" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Caution"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="images/caution.png"></td><th align="left">Caution</th></tr><tr><td align="left" valign="top"><p><code class="literal">spring-cloud-sleuth-stream</code> is deprecated and should no longer be used.</p></td></tr></table></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Spring Cloud Sleuth is <a class="link" href="https://opentracing.io/" target="_top">OpenTracing</a> compatible.</li></ul></div><div class="important" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Important"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="images/important.png"></td><th align="left">Important</th></tr><tr><td align="left" valign="top"><p>If you use Zipkin, configure the probability of spans exported by setting <code class="literal">spring.sleuth.sampler.probability</code>
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(default: 0.1, which is 10 percent). Otherwise, you might think that Sleuth is not working be cause it omits some spans.</p></td></tr></table></div><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png"></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>The SLF4J MDC is always set and logback users immediately see the trace and span IDs in logs per the example
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shown earlier.
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Other logging systems have to configure their own formatter to get the same result.
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@@ -80,7 +80,7 @@ The former is simpler to understand and test and does not tempt users with span
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> userCode() {
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span.annotate(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"tx.started"</span>);
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...
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}</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_rpc_tracing" href="#_rpc_tracing"></a>3.1.5 RPC tracing</h3></div></div></div><div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Tip"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="images/tip.png"></td><th align="left">Tip</th></tr><tr><td align="left" valign="top"><p>Check for <a class="link" href="https://github.com/openzipkin/brave/tree/master/instrumentation" target="_top">instrumentation written here</a> and <a class="link" href="http://zipkin.io/pages/existing_instrumentations.html" target="_top">Zipkin’s list</a> before rolling your own RPC instrumentation.</p></td></tr></table></div><p>RPC tracing is often done automatically by interceptors. Behind the scenes, they add tags and events that relate to their role in an RPC operation.</p><p>The following example shows how to add a client span:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Autowired</span></em> Tracing tracing;
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}</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_rpc_tracing" href="#_rpc_tracing"></a>3.1.5 RPC tracing</h3></div></div></div><div class="tip" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Tip"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="images/tip.png"></td><th align="left">Tip</th></tr><tr><td align="left" valign="top"><p>Check for <a class="link" href="https://github.com/openzipkin/brave/tree/master/instrumentation" target="_top">instrumentation written here</a> and <a class="link" href="https://zipkin.io/pages/existing_instrumentations.html" target="_top">Zipkin’s list</a> before rolling your own RPC instrumentation.</p></td></tr></table></div><p>RPC tracing is often done automatically by interceptors. Behind the scenes, they add tags and events that relate to their role in an RPC operation.</p><p>The following example shows how to add a client span:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Autowired</span></em> Tracing tracing;
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<em><span class="hl-annotation" style="color: gray">@Autowired</span></em> Tracer tracer;
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// before you send a request, add metadata that describes the operation</span>
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