private String getSender(final String procId) {
    if (Thread.currentThread().getName().startsWith(Connection.THREAD_KIND_IDENTIFIER)) {
      return procId;
    }

    return "sender=" + getSender() + procId;
  }
sets the breadcrumbs for this message into the current thread's name
geode-core/src/main/java/org/apache/geode/distributed/internal/DistributionMessage.java