public void setLabelNamespace(String labelNamespace) {
        this.labelNamespace = labelNamespace;
    }
<p>
The label namespace prefix for this rule group. All labels added by rules in this rule group have this prefix.
</p>
<ul>
<li>
<p>
The syntax for the label namespace prefix for a managed rule group is the following:
</p>
<p>
<code>awswaf:managed:&lt;vendor&gt;:&lt;rule group name&gt;</code>:
</p>
</li>
<li>
<p>
When a rule with a label matches a web request, WAF adds the fully qualified label to the request. A fully
qualified label is made up of the label namespace from the rule group or web ACL where the rule is defined and
the label from the rule, separated by a colon:
</p>
<p>
<code>&lt;label namespace&gt;:&lt;label from rule&gt;</code>
</p>
</li>
</ul>

@param labelNamespace
       The label namespace prefix for this rule group. All labels added by rules in this rule group have this
       prefix. </p>
       <ul>
       <li>
       <p>
       The syntax for the label namespace prefix for a managed rule group is the following:
       </p>
       <p>
       <code>awswaf:managed:&lt;vendor&gt;:&lt;rule group name&gt;</code>:
       </p>
       </li>
       <li>
       <p>
       When a rule with a label matches a web request, WAF adds the fully qualified label to the request. A fully
       qualified label is made up of the label namespace from the rule group or web ACL where the rule is defined
       and the label from the rule, separated by a colon:
       </p>
       <p>
       <code>&lt;label namespace&gt;:&lt;label from rule&gt;</code>
       </p>
       </li>
aws-java-sdk-wafv2/src/main/java/com/amazonaws/services/wafv2/model/DescribeManagedRuleGroupResult.java