public void setKey(String key) {
        this.key = key;
    }
<p>
A type of tag on which to filter. For example, <i>serverType</i>.
</p>

@param key
       A type of tag on which to filter. For example, <i>serverType</i>.
aws-java-sdk-discovery/src/main/java/com/amazonaws/services/applicationdiscovery/model/ConfigurationTag.java