static boolean checkForBrave() {
      try {
        Class.forName("brave.Tracing");
        return true;
      } catch (ClassNotFoundException e) {
        return false;
      }
    }
This helps solve a number of problems including the following, which sometimes only break in an
alpine JRE. The solution is to go with pure properties instead.

<pre>
<p>ConditionalOnClass(name = "brave.Tracing")
<p>ConditionalOnBean(Brave.class)
</pre>
zipkin-server/src/main/java/zipkin2/server/internal/ConditionalOnSelfTracing.java