ision of 0.01.
For example, to trace 5 requests out of every 10000, use 0.05 as the value here.</p><h2 id=customizing-tracing-tags>Customizing tracing tags</h2><p>Custom tags can be added to spans based on literals, environmental variables and
client request headers in order to provide additional information in spans
specific to your environment.</p><div><aside class="callout warning"><div class=type><svg class="large-icon"><use xlink:href="/v1.8/img/icons.svg#callout-warning"/></svg></div><div class=conten