public ListServiceLevelObjectivesRequest addKeyAttributesEntry(String key, String value) {
        if (null == this.keyAttributes) {
            this.keyAttributes = new java.util.HashMap<String, String>();
        }
        if (this.keyAttributes.containsKey(key))
            throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
        this.keyAttributes.put(key, value);
        return this;
    }
Add a single KeyAttributes entry

@see ListServiceLevelObjectivesRequest#withKeyAttributes
@returns a reference to this object so that method calls can be chained together.
aws-java-sdk-applicationsignals/src/main/java/com/amazonaws/services/applicationsignals/model/ListServiceLevelObjectivesRequest.java